5 and 11 are prime. The others are not (3 x 4 =12, 3 x 5 =15, 2 x 11 =22)
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12, 14, 15, 16, and 18 are composite numbers 11, 13, 17, and 19 are prime numbers
11 and 13 are prime numbers but 15 is a composite number because it has more than two factors
All except 15
The composite numbers between 11 and 19 are: 12 14 15 16 18 The other numbers, 11, 13, 17, and 19, are all prime.
2, 3, 5, 7, 11, 13, 17, 19 ARE prime numbers! 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20 are NOT prime numbers!