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You take the square root of the number. If it is a perfect square, this will be a whole number. If it is not, it isn't a perfect square.
51 is not a perfect square. 72 = 49 82 = 64 51 is between 49 and 64 so its square root is 7+a bit, and it is not a perfect square.
2, 8, 18, 32, 50, 72...
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It is: 72/104 = 9/13 in its lowest terms