6 and 9 are not prime numbers 23 is the only Prime number in this group
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9
23 is a prime number but 9 and 22 can both be factored 9 is 3x3 and 22 is 2x11
The prime factorization of 9 is 3 x 3 or 3^23*3
Two and nine are prime numbers. Two is the only even prime number.
4, 6, 9, etc.