9 is a composite number.
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Not a prime number, as for example it can be divided by 9 101 x 9 = 909
The number 9 is an example of a number that is both odd and composite. An odd number is one that is not divisible by 2, and a composite number is one that has more than two positive divisors. In the case of 9, its divisors are 1, 3, and 9, making it composite as well as odd. Other examples include 15, 21, and 25.
It is a composite.
90 has factors other than 1 and itself, so it is not a prime number. For example, 90 is 9 x 10, so it is a composite number.
A prime number is not divisible by any numbers except 1 and itself. A composite number is divisible by other numbers. 9 is divisible by 3, so it is a composite number.