Composite number
A composite number is a positive integer with three or more divisors. Every integer (excluding one and zero) is either a prime number or a composite number. The integer 14 is
a composite number because it has divisors 1,2,7, and 14 (four divisors). Note that a square number will always have an odd number of divisors (9 has divisors 1,
3, 9) while a non-square number always has an even number of divisors.
Because the number 1 and the composite number itself are not prime numbers, a composite number can also be defined as "a
non-prime number with one or more prime factors".
Properties
- All even numbers greater than 2 are composite numbers.
- All composite numbers are non-primes.
- The smallest composite number is 4.
- For
all composite number greater than 4 (Wilson's theorem).
- For all
composite number greater than 4 (composite theorem).
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