47 is a Prime number and not a composite number.
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47 is prime, the rest are composite.
47, 29 & 37 are prime numbers while 49 is a composite number.
Both 41 and 47 are prime numbers.
prime: 31, 37, 41, 43, 47 composite: the others
47 is a prime number and is divisible by 1 and 47 only. 51 is divisible by 1, 3, 17, 51.