Gee, I don't know. Let's check it out.
If it is, then 18 x 18 = 81 . 18 x 18 = 324 Nope. 18 x 18 is not 81, so 18 is not a square root of 81.
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The square root of -81 = 9 i9i
The square root of 81 is 9
The square root of 6561 is 81
The square root of 81 squared is 81.
the square root of 64 is 8 because 8x8 is 64 the square root of 81 is 9 because 9x9 is 81