2 and 3 are prime numbers that are factors of 12. There is an infinite list of prime numbers that aren't.
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Since 12 is a factor of 24, all of its factors, prime or otherwise, are common.
Prime numbers have one distinct prime factor.
Not a lot. They're both prime numbers. A factor that is prime is used to make other numbers.
4 and 12 are both even numbers greater than 2. They are composite numbers because 2 is a factor in addition to 1 and itself.
The prime factors of 12 are 2 and 3. The only prime factor of 27 is 3. The prime number that both 12 and 27 have as a factor is 3.