29 and 31 are prime.
The rest are composite numbers.
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Prime numbers: 11, 13, 17, 19, 23, 29 Composite numbers: 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30
the first one 11 others are not 15 = 3 x 5 21 = 3 x 7 27 = 3 x 9 56 = 4 x 14
NO. Not all odd numbers are prime like 9, 15, 21, 27,... because they have other factors aside from 1 and itself.
23 and 27 are prime numbers whereas 36 and 39 are composite numbers.
13