SOLUTION: How many positive integers are less than 100 and have an odd number of factors?

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Question 913221: How many positive integers are less than 100 and have an odd number of factors?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
Only positive integers with an odd number of factors are perfect squares.

1, 4, 9, 16, ..., 81 (=9^2)

Answer = 9