What are composite numbers ?Any number other than 1, which is not a prime number is a composite number.
Thus a composite number is a number which has at least one factor other than 1 and itself.
Every composite number can be written as the product of 2 or more distinct prime numbers.
The number 1 is neither prime nor composite.
Classification based on number of distinct prime factors:
- 4 = 2 x 2 6=2 x 3
12 = 2 x 2 x 3
12 is multiple of 2 distinct primes 2 and 3. Thus 12 is also a semi prime number.
- 30 = 2 x 3 x 5
Those composite numbers which have 3 distinct prime factors is called a sphenic number.
Classification based on repetition of prime factors:
- 64 = 26
- 210 = 7 x 5 x 2 x 3
When none of the prime factors of a number are repeated, the number is called a squarefree number.
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Also See :- What are Perfect Numbers ?
What is a Co-prime or Relatively prime number ?
Definition of prime number
Properties of Integers