Any number that is the square of an even number
ie
4[2] , 16[4] ,36 [6],64 [8] ,100[10], etc etc etc
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25 25 is not even and is a square. 3 is not even or a square.
Any integer ending in 0, 2, 4, 6, or 8 is an even number, so yes, 100 is even. Any number that is the product of two of the same integers is a square number. Since 10 X 10 = 100, 100 is a square number.
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).
both
16, which is the square of 4, is a two digit even number.