4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30 are the composite numbered dates in September.
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September has 19 days that are prime numbers Note: 1 is not prime or composite
September has 19 days that are prime numbers Note: 1 is not prime or composite
September has thirty days. Of the numbers 1-30, the following are prime: 2,3,5,7,11,13,17,19,23,29. The others are composite, except 1 which is neither! So, 10 primes, 19 composites, and 1
2 3 5 7 11 13 17 19 23 29 are prime. The rest (except 1) are composite. Prime numbers have two factors; composite numbers have more than two.
The number of composite numbers is infinite.