12, 49, and 99 are composite, the rest are prime.
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12, 14, 15, 16, and 18 are composite numbers 11, 13, 17, and 19 are prime numbers
2 is an even prime number. 3, 7, 11, 13 are odd prime numbers.
11 and 13 are prime numbers but 15 is a composite number because it has more than two factors
prime numbers between 12 and18: 13, & 17
The numbers 11, 13, 17 and 19 are prime.