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Perfect squares have an odd number of factors.

Q: What numbers with an odd numbers of factors?

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Yes, the factors of all odd numbers are odd numbers.

Square numbers have odd numbers of factors.

Both odd and even numbers may have odd numbers as factors.

Yes. Square numbers have an odd number of factors. 49 has three factors.

Square numbers have an odd number of factors.

Some even numbers have more factors than some odd numbers and some odd numbers have more factors than some even numbers. As a group, even numbers have more factors than odd numbers.

Some even numbers have more factors than some odd numbers and some odd numbers have more factors than some even numbers. As a group, even numbers have more factors than odd numbers.

All nonzero numbers have factors. Some factors are even numbers, some factors are odd numbers.

Square numbers have an odd number of factors.

Square numbers have an odd number of factors.

Square numbers have an odd number of factors.

Even numbers must have 2 amongst their factors; they may have other even numbers amongst their factors. Odd numbers must not; every factor of an odd number must be odd.