Prime numbers are also called prime numbers. A natural number greater than 1 is called a prime number, except for 1 and itself, which cannot be divisible by other natural numbers.

Composite number refers to the number divisible by other numbers (except 0) except 1 and itself in natural numbers.

Simply put, a number can only be divisible by 1 or itself to be a prime number, otherwise it is a composite number.

Example:

The smallest composite number is 4, which can be divisible by 1 and itself, or by 2.

The smallest prime number 2,2 can only be divisible by 1 and itself.

Extended data:

Complex attribute

1, all even numbers greater than 2 are composite numbers.

2. In all odd numbers greater than 5, all numbers with 5 are composite numbers.

3. Except 0, all natural numbers whose unit is 0 are composite numbers.

4. All natural numbers with units of 4, 6 and 8 are composite numbers.

5. The smallest (even) complex number is 4, and the smallest odd complex number is 9.

References:

Baidu encyclopedia-prime number

Baidu encyclopedia-composite number