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20 cannot be prime because prime numbers will only have a factor 1, whereas 20 has:
1 x 20
2 x 10
4 x 5
Thus 20 is composite
20 is a Composite Number.
Prime.
89 is a prime number.
67 is a prime number.
Composite
37 is the 12th prime number.
prime
5 is prime
29 is a prime number.
Composite.
It is composite.
47 is a prime number.
5 is a prime number.