9 is not a Prime number.
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A factor can or cannot be a prime number Ex: 2 is the factor of all other even numbers its a prime number but 9 is a factor of 18 and its not a prime number A prime is a factor but a factor being a prime number varies
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.
what number is not a prime factor
A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.
The greatest prime factor they have in common is 2.