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2- What are odd number?
If a number is not divided by 2 is called odd number.
1, 3, 5, 7, 9, ....

3- What is a prime number?
A number is greater than 1 is called a prime number, if it has only two factors, 1 and the number itself.
2, 3, 5, 7, ...

4- What is a composite?
A number is greater than 1 is called a composite number, if it has more than two factors.
4, 6, 8, 9, 10, ...
Which is matching according to above question 4, 6, 8, 9, ... . Therefore above given number are composite number.