How is 81 a Square number?
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3
Answer:
9×9=81
multiple of 9 so a square no
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2
Answer:
A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 81 is 9. Therefore, the square root of 81 is an integer, and as a consequence 81 is a perfect square. As a consequence, 9 is the square root of 81.
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