Prime numbers have only two factors whereas composite numbers have more than two factors
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Is 11 a prime or composite
A prime number has exactly two factors, 1 and itself. A composite number has more than two factors.
Any two prime numbers will be relatively prime. Numbers are relatively prime if they do not have any prime factors in common. Prime numbers have only themselves as prime factors, so all prime numbers are relatively prime to the others.
Products of prime numbers are composite numbers.
The opposite of prime numbers are composite numbers.