16, 25, 36, 49, 64, or 81
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22
16, which is the square of 4, is a two digit even number.
64. 64 = 82 = 43 26 = (23)2 = (22)3 = 64.
A perfect square is a number that can be expressed as the product of two equal integers.
64 Factors: 1, 2, 4, 8, 16, 32, and 64.