11, 13, 17, 19, 23, 29 are the primes between 10 and 30 so the composite numbers are all the others. 12,14,15,16,18,20,21,22,24,25,26,27,28, and 30 are the composite numbers between 10 and 30.
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Not all composite numbers are even, but all even numbers except 2 are composite.
The number of composite numbers is infinite.
Composite numbers have more than 2 factors.
Three composite numbers are 1 3 6
41 is a prime number. It has no composite numbers as factors.