9 is an odd composite number. It is composed of a single prime number multiplied by itself.

An odd number is an integer when divided by two, either leaves a remainder or the result is a fraction. One is the first odd positive number. Some examples of odd numbers are 1, 3, 5, 7, 9, and 11.

9 is the fourth composite number, and the first odd composite number. 9 is also a refactorable number.

A number which is not divisible by “2” is called an odd number. An odd number always ends in 1, 3, 5, 7, or 9.

The smallest odd composite number is 9. If we start looking at the smallest composite number it is 4, but that is an even number. The next composite number is 6 which is again an even number. The same goes for the next composite number which is 8. Now, the next composite number is 9 which is an odd number.