



 
Hi Jolyn, I can help some. If a positive integer $n$ is a square then each of its prime factors divides $n$ an even number of times. For example 25 is a square and $25 = 5^{2}.$ Also $144$ is a square and $144 = 2^4 \times 3^{2}.$ The converse is also true, if each of the prime factors of $n$ divides $n$ an even number of times then $n$ is a square. I hope this helps, Penny  


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