Composite Number
What is composite number?
A number that has more than two different factors is a
composite number. So, a composite number is also exactly divisible by numbers
other than 1 and itself.
A whole number having at least 3 factors is called the
composite number.
Consider the numbers 4, 6 and 15.
(i) The factors of 4 are 
1 × 4 = 4
2 × 2 = 4
4 × 1 = 4
So, 1, 2 and 4 are the factors of 4.
(ii) The factors of 6 are 
1 × 6 = 6
2 × 3 = 6
6 × 1 = 6
So, 1, 2, 3 and 6 are the factors of 6.
(iii) The factors of 15 are 
1 × 15 = 15
3 × 5 = 15
5 × 3 = 15
15 × 1 = 15
So, 1, 3, 5 and 15 are the factors of 15.
Thus 4, 6 and 15 are composite numbers.
Let us find all the factors of 4, 6, 8 and 9
4 is divisible by 2, 1 and 4. So, the factors are 1, 2 and
4.
6 is divisible by 2, 3, 1 and 6. So, the factors are 1, 2, 3
and 6.
8 is divisible by 2, 4, 1 and 8. So, the factors are 1, 2, 4
and 8.
9 is divisible by 3, 1 and 9. So, the factors are 1, 3 and
9.
Note:
The number 1 is neither prime nor composite. 1 is called a unique number. The number 1 has exactly one factor the number itself.
The number 2 is a prime as well as an even number.
Composite numbers include both even and odd numbers.
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