51
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51 is composite (3 x !7); the other numbers are primes.
82 is a composite number 83 is a prime number
83 is a prime number because it is only divisible by 1 and itself (83) if would be composite if it were divisible by any other number.
83 is a prime number because it is only divisible by 1 and itself (83) if would be composite if it were divisible by any other number.prime
87 is a composite number because it can be divided evenly by 3.