A number that is divisible by 4.
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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).
16, which is the square of 4, is a two digit even number.
The square of every positive or negative even whole number is a positive even whole number. The square of every positive or negative odd whole number is a positive odd whole number. There are an infinite number of each kind.
4 add 12 = 16 and that is an square number