1, 2, 4, 8
2 is prime.
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2 is the only prime factor of 8
8 is not a prime factor of 30. The prime factorization of 30 is 2x3x5.
Numbers that have no common factor like 8 and 9 as 8=23 and 9=32 The two of them are not prime but they have no common factor
2
8 is not prime a prime number because it has other factors aside from 1 and itself.The other factor of 8 is 2.