Because 9*9 = 81
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100
No negative number can be a square. (At least not using the kind of numbers you've learned to use so far.)
The first ten perfect squares are 1, 4, 9, 16, 25, 36, 49, 64, 81, and 100.
no it is not. perfect squares are 1 4 9 16 25 36 49 64 81 100 121 144 169...
The perfect squares less than 101 are: 1, 4, 9, 16, 25, 36, 49, 64, 81, and 100