The square root of 81 is: ±9 (9 or -9)
A square root is a number which, when multiplied by itself, equals the original number. As 9 x 9 = 81 and -9 x -9 = 81, the answer is plus or minus nine.
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The square root of 6561 is 81.
The quad root of 81 is 3 but the square root of 81 is 9
81 is the square root of 405. (81 x 5 = 405.)
No. The square root of 81 is 9, which is a rational number.
81