81 is the square of 9, and is also a multiple of 3 because 3(27) = 81.
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81 is a square number
9, 36, 81 etc
9 * 9 = 81 and3*3*3*3 = 81
3 or -3. 32 = 9 and (-3)2 = 9 * * * * * +3 and -3 do not have the square root of 9 - they are the square roots of 9. The number 81 has the square root 9.
9