9 is not a Prime number and neither 6 is a prime because they have more than 2 factors.
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Out of 9, 6, and 5, five is the prime number.
5 is a prime number. The others are not.
2 is prime.
Well, 6 is not prime because 2 multiplied by 3 is 6 and 6 multiplied by 1 is 6. 4 is also not a prime because 2 multiplied by 2 is 4 and 4 multiplied by 1 is 4. 9 is also not a prime because 32 is 9 and 9 multiplied by 1 is 9. 2 is the only number left, so therefore 2 is the prime number of 6, 4, 2, and 9.
Both 6 and 9 have the number 3 as a prime factor. 6 = 3 x 2 9 = 3 x 3