README

You’re a square

A square of squares

You like building blocks. You especially like building blocks that are squares. And what you even like more, is to arrange them into a square of square building blocks!

However, sometimes, you can’t arrange them into a square. Instead, you end up with an ordinary rectangle! Those blasted things! If you just had a way to know whether you’re currently working in vain… Wait! That’s it! You just have to check if your number of building blocks is a perfect square.

Task

Given an integral number, determine if it’s a square number:

In mathematics, a square number or perfect square is an integer that is the square of an integer; in other words, it is the product of some integer with itself.

The tests will always use some integral number, so don’t worry about that in dynamic typed languages.

Examples

isSquare(-1) returns  false
isSquare(0) returns   true
isSquare(3) returns   false
isSquare(4) returns   true
isSquare(25) returns  true
isSquare(26) returns  false

Source