It is: 3*3*3 = 27
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3 x 3 x 3 or 3^3 = 27
19 is the prime number.
The numbers 13 and 29 are prime - the one composite number in that list is 27.
5, 11 and 17 are prime number but 9 and 27 are composite numbers
27 isn't a prime number, it is 3^3 and 41 is prime