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81 is a perfect square because 81 = 9 x 9
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Earn +20 ptsQ: What is 81 a perfect square by what number?
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Why is 81 both a perfect square and a perfect cube?
81 is a perfect squarebecause 81 = 9*9. It is NOT a perfect cube.
What is the largest perfect square factor of 405?
81 is the only one.
Is the root of 81 an irrational number?
No. The square root of 81 is 9, which is a rational number.
Is 80 a perfect square number?
No, 80 is a not perfect square.
A perfect square is a number that has an integer square root?
Yes, a perfect square is a number that has an integer square root.
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