The next perfect square after 81 (92) is 100 (102).
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Nope - 81 is a square number, and the next one is 100. 89 is actually a PRIME number
81 is a square number
The square root of 6561 is 81
No but 81 is a square number
5 is not a square number, the square numbers are: 1 4 9 16 25 36 49 64 81 100 122 144