show that 121 is a perfect square
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it is a square of 11.
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A number is a perfect square (or a squarenumber) 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 121 is 11. Therefore, the square root of 121 is an integer, and as a consequence 121 is a perfect square.
simple,
factor of 121 is 11×11
simple,
factor of 121 is 11×11
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