SOLUTION: do 9, 25, 64, 144 have an odd number of factors?

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Question 773422: do 9, 25, 64, 144 have an odd number of factors?
Answer by jim_thompson5910(35256) About Me  (Show Source):
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Yes they do. All perfect squares have an odd number of factors. Also, only numbers that are perfect squares have an odd number of factors.