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12 is a composite number, not a prime factor.
The smallest prime factor of 12 is 2.
The largest prime factor of 12 is 3. Prime factors of 12 are 2 x 2 x 3.
All numbers have factors. Some numbers have some of the same factors as other numbers. These are common factors. If the factor is a prime number, it is a common prime factor. 3 is a prime number. 3 is a factor of 9. 3 is a factor of 12. 3 is a common prime factor of 9 and 12.
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