Misclicked 'Submit' before removing print(), duh

Ouch, that hurts

Thank you, I missed that - then indeed there's no need for dealing with sqrt- and ^2-ing :)

Only valid for integer x. Works wrong for, say, x = 31.7

Like this one so much!

In this particular case it doesn't make sense.
Probably author had to cast while developing the solution and then forgot to remove it during final refactoring.