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
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!