A composite number is any whole number that isn't a prime number or 1. A Prime number is a whole number that is only divisible by itself and 1.
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321 is a composite number because it has more than two factors
2 is prime.
It depends on what you mean by an opposite. Every real number has an additive opposite but 0 does not have a multiplicative opposite.
The opposite number of 9 is -9. In mathematics, the opposite of a number is the same distance from zero on the number line, but in the opposite direction. This is denoted by adding a negative sign in front of the number, indicating its direction opposite to the original number.