Q: Do odd numbers have a odd or even number of factors?

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Even powers of prime numbers. 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.

Composite numbers can have either an odd number or an even number of fractions. Factors of 25 are 1, 5, 25 . (odd number of them) Factors of 26 are 1, 2, 13, and 26 . (even number of them)

No, only square numbers have an odd number of factors.

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

Related questions

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

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

Even powers of prime numbers. Square numbers have an odd number of factors.

An even power. 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.

No. Perfect square numbers have an odd number of factors.

Composite numbers can have either an odd number or an even number of fractions. Factors of 25 are 1, 5, 25 . (odd number of them) Factors of 26 are 1, 2, 13, and 26 . (even number of them)

No, square numbers have an odd number of factors.

No. Odd numbers don't have even factors.

No, only square numbers have an odd number of factors.

Not only can they, but they must. An odd number cannot have an even factor. So none of the factors of either of the two odd numbers can be even and so the GCF is made up of only odd factors and so it must be odd.

Both. 9 has three factors. 11 has two factors.