81 is a square number because 81 is 9.9 x 9 and that makes is a square number. Somw how, i don't even know why 9.9 x 9 = 81. So that's all i know, that's alli can say.
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81 is a square number
The square root of 6561 is 81
No but 81 is a square number
Yes. Square root of 81= 9
The next perfect square after 81 (92) is 100 (102).