81
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49 equals 72, and the next square number is 82 = 64.
64 is 82
64 is a square number because 64*64=4096 and that can not be shown in a square That is so not true. 64 is a square since 8*8 = 64.
64 is a square number; 8x8 = 64.
64 is a perfect square number.