4 add 12 = 16 and that is an square number
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25 25 is not even and is a square. 3 is not even or a square.
The square root of an even number can be an even number (if it is a perfect square), or an irrational number (if it is not).
It is an even number.
Yes. One has to be the square of an odd number. The other square has to the the square of the even number either before or after the odd number. If this is confusing just plug in real values. In either case, an odd times and odd is odd. Therefore one of the squares has to be odd. AN even times an even, however, is always even. Therefore, the second square has to be even. Thus, one of the squares is even and the other is odd. An even plus and odd is always odd.
An even number.