[Question]
  [
# Overview
Consider the following task:
> 
> Given a positive integer **n > 0**, output its integer square root. The integer square root of a number **n** is the largest value of **x** where **x2 ≤ n**, usually expressed with the formula `floor(sqrt(n))`.
> 
> 
> Examples: `25 -> 5`, `24 -> 4`, `40 -> 6`, `1 -> 1`.
> 
> 
> 
This task is easy enough on its own. However, in this challenge, your task is to solve this in *as many languages as possible* using a set of only *25 characters.*
# Example
First, you need to pick a *set* (no duplicates) of 25 bytes. It may look something like this (note the leading space):
```
 ()*-.05:=>Mabdhilmnqrst|
```
Your challenge is then to, using only characters in this set, construct a solution to the problem in as many *text based* (sorry, Piet) languages as possible. You can use characters as many times as necessary, but you must not use characters outside the set.
The solutions can be either *full programs* or *functions*, but not snippets. For example, using this set of characters, I could do:
```
M -> (int) Math.sqrt(M)    // Java (lambda expression)
M => Math.sqrt(M)|0        // Javascript (unnamed function)
lambda M: int(M**.5)       // Python (lambda function)
```
As I've used 3 languages, this would give me a score of **3**.
Please also include the set of bytes you are using in your answer.
## Rules
* This is a [rosetta-stone](/questions/tagged/rosetta-stone "show questions tagged 'rosetta-stone'") challenge - your score is the number of languages your submission includes. The highest score wins. Standard loopholes apply.
* For this challenge, a 'language' counts as a distinctly different programming language - multiple versions of the same language (Python 2, Python 3, etc) are banned.
* Programs only need to work for inputs within the language's standard integer range.
* Programs with the exact same source code (polyglots) are not allowed.
* To be more specific, it is a set of *bytes*, not characters - so you can use the 05AB1E `£` and the Jelly `ɱ` as the same character (because they have the same codepoint).
Please don't feel as though you have to beat all other solutions - if you have an interesting answer, post it!
  
[Answer]
# 20 languages
Using `()-#*.05;=>^Vefikloqrst` (24 characters) so far:
```
let f l=floor(l**0.5);;       OCaml
let f l=floor(l**0.5)         F#
f(l)=floor(l^.5)              Julia
f(o)=floor(o^.5)              PARI/GP
s^+>5 0>5 0*.5l               Pyth
(* **.5).floor                Perl 6
floor.(**0.5)                 Haskell
flr.(tt ^.5)                  Wonder
l=>l**.5^0                    JavaScript
l->l**.5^0                    Cheddar
.5^5*5f                       Pyke
(isqrt)                       Maple
ri.5#i                        CJam
isqrt                         Common Lisp
0.5^k                         MATL
*.5^0                         Jelly
*.^0                          M
t0^                           05AB1E
q f                           Japt
r#                            Pushy
V-                            gs2
```
[Answer]
# 10 languages
Character set of 19 characters (in **CP-1252**):
```
,-/12@QUVX^fkmt¬÷␊␍
```
Where `␊` represents a *line feed* and the `␍` represents a *carriage return*.
([Script for checking the characters](https://tio.run/nexus/05ab1e#@19TVqludWih4eEVhzccnu1Ve3iVi4KCUmhxaopCckZiUWJySWpRsZWC@uH96ko6XArIIB2o0Cc1L70kw0rh8H4lnf//vVJzciqtQHKPJvQ@mtDFZWDq6GToChIpMYzQjeNyDzaygmgO0@Xyys9Jg/By00K5vBILSiC8Q2vSuHwdQ3wgvIi4bK6AyuxUCE/HMA3IA9kIAvoOgUYlRlz@icWZxWARQ6ClRvq5hoe3cxkVJyblpMKsjojQ1Y0DAA))
  
### Jelly, 2 bytes
```
Æ½
```
[Try it online!](https://tio.run/nexus/jelly#@3@47dDe////G5kAAA "Jelly – TIO Nexus")
### 05AB1E, 2 bytes
```
t1X-^
```
[Try it online!](https://tio.run/nexus/05ab1e#@19iGKEb9/@/kQkA "05AB1E – TIO Nexus")
### GS2, 2 bytes
```
V-
```
[Try it online!](https://tio.run/nexus/gs2#@x@m@/@/kQkA "GS2 – TIO Nexus")
### Jolf, 3 bytes
```
mfU
```
[Try it here!](http://conorobrien-foxx.github.io/Jolf/#code=bWZV&input=MjQKCjI1) (works best on Firefox)
### Japt, 2 bytes
```
¬f
```
[Try it here!](http://ethproductions.github.io/japt/?v=1.4.3&code=rGY=&input=MjQ=)
### MATL, 3 bytes
```
X^k
```
[Try it online!](https://tio.run/nexus/matl#@x8Rl/3/v5EJAA "MATL – TIO Nexus")
### Pyke, 3 bytes
```
,1f
```
[Try it here!](http://pyke.catbus.co.uk/?code=%2C1f&input=24)
### Pyth, 6 bytes
```
/@Q2t2
```
[Try it here!](https://pyth.herokuapp.com/?code=%2F%40Q2t2&input=24&debug=0)
### Oasis, 6 bytes
```
1␊2/m1÷
```
[Try it online!](https://tio.run/nexus/oasis#@2/IZaSfa3h4@////41MAA "Oasis – TIO Nexus")
### 2sable, 9 bytes
```
t1X-XX--^
```
[Try it online!](https://tio.run/nexus/2sable#@19iGKEbEaGrG/f/v5EJAA "2sable – TIO Nexus")
[Answer]
# 5 languages
Gonna add more languages soon.
### Character set (22 bytes):
```
s^Q.5=>*|0√Lrdmlab :/1
```
### Pyth
```
s^Q.5
```
### Javascript
```
Q=>Q**.5|0
```
### Actually
```
√L
```
### CJam
```
rdmQ
```
### Python
```
lambda Q:Q**.5//1
```
[Answer]
# 5 languages
```
[].,+<>{}()0134879
```
18 characters.
I'm trying not to use any alphabet characters...
**[Brainfuck](https://tio.run/nexus/brainfuck#7ZmxDcQwDAMHUvBVSoKLGNp/DEeW3/gHMgKpKnB5oEkqntcYjJ6BEB2G9iSHOIE/BcA0EEwA8qJgAJlXco84jgFYFOUUrQp7RHtEyGMoDtxGQWtiwch2iYLRZNaZeLkqGGEI8hX7lIjv9VgfzlJ5y0wHRwsBCTcqytukY0LeEL1od4OGreAXD44G7aldEt0QXJQKw/7ZwL1qn1cbkzl3JfmRD9G0KF6imPO@Hw), [Brainfuck++](http://www.jitunleashed.com/bf/index.html), [Brainfuck-ng](https://github.com/elboza/brainfuck-ng/), [Braintrust](https://gist.github.com/Sgeo/fe54715fc61d1d98f4cc), ...**
```
,[[>++++++[<++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]>[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>++++++++++<]>[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<+>]<<<[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>>+<<]],]>>>>>>>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++[<<<<<[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>+>+<<]>[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<+>]<<+[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<<+>>>>+<<]>>[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<<+>>]<<<<[>>[<+>>>+<<+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]<[>+<+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]<+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]>>>>>>>>+<<<<[>>>+<<[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>+>[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]<<]>>[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>+<]<[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<+>]<+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]>[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]>>>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]<<<<<<+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<++++++++++>[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++[<+<<]<[+[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>+<]<+<<]>>>>>]<<<[<++++++[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>++++++++<]>.[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++]]++++++[+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>++++++++<]>.
```
Doesn't work for over `224` because `256` (= (sqrt(225)+1)^2) overflows.
Replaced all `-`s with `+`s to use one less character. (e.g. `-` -> 255 `+`s)
*Original Program*
```
,[[>++++++[<-------->-]>[->++++++++++<]>[-<+>]<<<[->>+<<]],]>>>>>>>-[<<<<<[->+>+<<]>[-<+>]<<+[-<<+>>>>+<<]>>[-<<+>>]<<<<[>>[<+>>>+<<-]<[>+<-]<-]>>>>>>>>+<<<<[>>>+<<[->+>[-]<<]>>[->+<]<[-<+>]<-<-]>[-]>>>-]<<<<<<-<++++++++++>[-<-[<+<<]<[+[->+<]<+<<]>>>>>]<<<[<++++++[->++++++++<]>.[-]]++++++[->++++++++<]>.
```
**[Brain-Flak](https://tio.run/nexus/brain-flak#TU3BDQAxCFoH/t2mcRLj7D2wvaYPDSDgQhZATjBokOYSiQOk6ZyVR2xnZYVDokaKzrcomDva/r3IcD3aqarQ8IKnqnzu9X9ba4wP)**
```
({}(())[()])(()){{}((({})({}((({}())))[{}{({})({}[()])}{}]))[({}[{}])])([({}(())[()])]){(({}()({}[(({}[(())]()){(([({}{})]{}))}{})]{}))[({}[{}])])}{}{}}{}{}({}[()])
```
@WheatWizard's code. Thanks for the permission!
**[Brain-Flueue](https://github.com/Wheatwizard/Brain-Flueue)**
```
({}())(())(())({}){{}({})({}<(({})<({({})({}[()])}{})>())>)([{}]<({})>({}))({}<‌​({}<([({})]){()<({}())>}{}(<()>){({}[()])([{}]())}{}>)>)({}<({})>)({})({})}{}({}[‌​()()]){}
```
Another @WheatWizard's code.
**[Numberwang](https://tio.run/nexus/numberwang#7ZnRDQMxDEJXAtWSz/sPljpOo1bqCOCvUz6fCODLeiJQM8ESHZT2JEKcwI8CaBosJEl5UaDIzCdxRhxHkBZFO8Wowh4xHlHyGJoDjlHAmtgwclyiYQyZfSZerhpGGYJ8xb4l4nM99oezVN4y08ExQmDSjQryNumYkDdEL9rToGkr@MaDo0F7epfkNAQXpcZwfjbgrNr31cZk7l1JvORDNC2KP1GsFfEG)**
```
8440999999419999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999909999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999997049999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999990999999999917049999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999991907111499999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999900911778700000009999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999994111114999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999090911704999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999190711949999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999991190000911700499999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999911900711114004190009119999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999997140919999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999997199999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999970000000091111400091149999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999990904999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999711700499999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999909171499999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999919071999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999199999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999970499999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999970009999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999997111111999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999199999999990499999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999919999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999994191171494999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999091719117000007111419999994999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999099999999170349999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999997799999949999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999990999999991703
```
**[Spoon](https://web.archive.org/web/20140228003324/http://www.bluedust.dontexist.com/spoon)**
```
00101100010000100010111111001000110000000000000000000000000100000011010001000000101111111111011001101000100000011101000110110110110010000001001010110110011001100101100011010010010010010010010000001000110110110110110010000001010101011011001101000100000011101000110110111001000000110111010010010010101101100110100100010000001101110100100011011011011011001000100100010001110100100101011011000001101100100010101100000110110000011010010010010010010010010101101101101100100010010010101101100100000010101000100000001101101100110100100010000001010110011011001000000111010001101100001100000110100010000000110100100100000011011011011011011011000011111111111101000100000011000001000111011011001101100100100100000010101100110111011011001101001001001001000110110110110010001111111100100000010111111110110011010001010001000000011001111111100100000010111111110110011010001010
```
[Per meta consensus,](https://codegolf.meta.stackexchange.com/a/11055/60043) this code should be okay, even though no interpreters are currently available.
[Answer]
# 5 languages
Using `()*/12 dlinpqrstu` and newline (18 characters) so far.
### Common Lisp
```
isqrt
```
A built-in function.
### QBasic
```
input q
print int(sqr(q))
```
### Python 3
```
print(int(int(input())**(1/2)))
```
Python 3 used for floating-point division without decimal points.
### Pip
```
q**/2//1
```
Unnecessarily golfy to show off the unary inversion operator `/`. Takes input from stdin. [Try it online!](https://tio.run/nexus/pip#@1@opaVvpK9v@P@/iREA "Pip – TIO Nexus")
### [tinylisp](https://github.com/dloscutoff/Esolangs/tree/master/tinylisp)
```
(d sqrt (q((n nsqr input) (i (l input nsqr) (s n 1) (sqrt (s n (s 1 2)) (s 2 (s (s (s 1 n) n) nsqr)) input)))))
(q((input)(sqrt 1 1 input)))
```
`sqrt` is a helper function whose arguments are: the current guess `n`, `n` squared, and the `input` number. If `input` is less than `nsqr`, we've gone too far, so return `n` minus 1; otherwise, recurse, adding 1 to `n` and adding `n + n + 1` to `nsqr`. (The math is a bit complicated because tinylisp only has subtraction built in.) The second line defines our actual function, which takes a single `input` and returns the result of `sqrt` with `n` starting at 1.
[Answer]
# 6 languages
Using `retun flosq(agm1)\,i` and extended codepoints `B1` and `BC` for 22 bytes so far.
**GameMaker Language**
```
return floor(sqrt(argument1))
```
**Pyke**
```
,1f
```
**Julia**
```
isqrt
```
**Maple**
```
(isqrt)
```
**Stuck**
```
i\
```
**TI-Basic (hex dump)**
```
B1 BC 72
```
Note that 0x72 is `r` in ASCII.
[Answer]
# 7 languages
`24` chars:
```
limQi->(nt)Mah.sqr_ ?;:\
```
### [CJam](https://esolangs.org/wiki/CJam)
```
limQ
li       e#Read Int
  mQ     e#Integer square root
```
### [Java](https://www.oracle.com/java/)
```
i->(int)Math.sqrt(i)
```
### [Chaincode](https://code.sololearn.com/cAw9mAl5Q9AX/?ref=app)
```
q_
q  #sQuare root
 _ #floor
```
### [Math++](https://esolangs.org/wiki/Math%2B%2B)
```
_sqrt ?
```
### [Grin](https://esolangs.org/wiki/Grin)
```
;q:
```
### [Stuck](https://esolangs.org/wiki/Stuck)
```
i\)
```
### [Unilinear](https://esolangs.org/wiki/Unilinear)
```
iMivMiMs
i            Read input
 Mi          Convert to int
    v        Square root
    Mi       Convert to int
      Ms     Convert to String
```
### R
```
sqrt
```
## Costs too much bytes
### [Python](https://www.python.org/)
```
lambda i:int(i**.5)
```
]