Which positvie integers have an odd number of positive divisors
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Which positvie integers have an odd number of positive divisors

[From: ] [author: ] [Date: 11-10-10] [Hit: ]
......
please i need help

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Think of it this way - all positive divisors come in PAIRS. So the only way for there to be an odd number of divisors is if one of those pairs is (x,x). That is - the number must be a PERFECT SQUARE.

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1 is one of the positive numbers with an odd number of positive divisors
4 is one of the positive numbers with an odd number of positive divisors

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perfect squares

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It has to be perfect squares!
1
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