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2 is prime.
9 is not a prime number and neither 6 is a prime because they have more than 2 factors.
2, 3, 5 are prime numbers but 9 is not a prime number
Because 9 is not a prime number
2 is the smallest prime number. 9 is the greatest composite number less than 10. The sum of 2 and 9 is 11.