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9 is a composite number; it has factors other than 1 and itself. It is a square number, so it has an odd number of factors.

The three factors of 9 are 1, 3, and 9.

The factor pairs of 9 are 1 x 9 and 3 x 3.

The proper factors of 9 are 1 and 3 or,

if the definition you are using excludes 1, they are only 3.

The prime factors of 9 are 3 and 3. Note: There is repetition of these factors, so if the prime factors are being listed instead of the prime factorization, usually only the distinct prime factors are listed.

The distinct prime factor of 9 is 3.

The prime factorization of 9 is 3 x 3 or, in exponential form, 32.

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Q: What are the factors and prime factors of 9?
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