What is composite number?
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.
Note: Composite numbers include both even and odd numbers.
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