Yes, 64 is a perfect squarebecause 64 = 8*8
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64 is both a perfect square and a perfect cube. It is a perfect square because (8 \times 8 = 64) and a perfect cube because (4 \times 4 \times 4 = 64).
Yes, just take its square root. Since it is an integer, 64 is a perfect square. Alternately, since the square of this integer is 64, 64 is a perfect square, by definition.
51 is not a perfect square. 72 = 49 82 = 64 51 is between 49 and 64 so its square root is 7+a bit, and it is not a perfect square.
How about 64 which is cube and square number because 4*4*4 = 64 and 8*8 = 64
64