None of the numbers 7, 11, and 13 are composite numbers; they are all primes.
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1001 is not prime. 1001 = 7 * 11 * 131001 is equal to 7 x 11 x 13, so it is composite.
91 is a composite number. The factors of 91 are 7 and 13
9 and 15 are composite numbers because they have more than two factors
It is 11*13 = 143
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31 are prime numbers. they are not composite numbers.