It is 35 because it has more than 2 factors
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1147 is a composite number. To be a prime number, it would have to be divisible only by itself and 1, however it is also divisible by 31 and 37.
All of them except for 31, 37, 41, 43 and 47 which are prime numbers
51 is composite.
37 is a prime number but 42 is a composite number
47, 29 & 37 are prime numbers while 49 is a composite number.