One (1) and Zero (0) are NOT prime numbers.
See the Related Question below for more information on prime numbers.
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Composite numbers are divisible by prime numbers.
Only 63. 0 and 1 are not composite numbers and are not prime numbers (even though 1 used to be). 19 is a prime number.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
The vast majority of positive integers can be classified in two ways: prime and composite. Prime numbers have only two factors, composite numbers have more than two. The numbers 1 and 0 are neither prime nor composite.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.