Composite Number

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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