+1 Clever Point for checking perfect squre differently than multiplying with the same number.

You're performing the Math.sqrt(sq) function twice, it would have been better to put that into a variable. Just to save yourself from calculating it twice. Clean solution though.

Thanks, I will check it

the % and / operations are computationally expensive, and are slow.
To make sure Math.sqrt(sq) has no decimal values, use
Math.sqrt(sq) != Math.floor( Math.sqrt(sq));