There are more than ten composite numbers and what they have in common is that they all have more than two factors whereas prime numbers have only two factors which are themselves and one.
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composite
10 is the only composite factor of 10.
It is not because 2 the last number is not a composite number
Yes, except for the number 1, which is a perfect square but not composite.
2 is the smallest prime number. 9 is the greatest composite number less than 10. The sum of 2 and 9 is 11.