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In mathematics, a number that can be divisible by other numbers except 1 and itself. 0'1'is neither a prime number nor a composite number.

A composite number, also known as a composite number, satisfies any of the following conditions

Positive integer of condition:

1 is the product of two integers greater than 1;

2. There are at least three factors (factors);

3. Non-prime numbers with at least one prime factor.

4. The product of two or more prime numbers can form a composite number, and only a composite number can be formed. On the contrary, a composite number can be divided into a product of a group of prime numbers, and only into a product of a group of prime numbers.

Note: "0" and "1"are neither prime numbers nor composite numbers.