7 (has no multiples)
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47 is.
No, 27 is not a prime number. 3x9 = 27
the 4th prime number is 7
27 is not a prime number.
27 is composite. 27 = 3 * 3 * 3 = 3315 is composite. 15 = 3 * 521 is composite. 21 = 3 * 723 is a prime number. It is only evenly divisible by itself and one.