n=p^2q
n is a multiple of 5
therefore either p is a multiple 5 or q is a multiple of 5
if p is a multiple 5, p^2 will be definitely a multiple of 25
if q is a multiple of 5, q^2 will be definitely a multiple of 25
therefore, p^2* q^2 will we have at least 1 multiple of 25.
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