It is a square number because 13 times 13 = 169
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169
28,561 is.
if p² = 169, then p = ±√169 In other words, take the square root of 169 and p is either the positive or negative value of the square root.
169 times 169 equals = 28561
169 = 1 x 169, or 169 = 13 x 13