The difference between composite numbers of prime factors is that prime numbers are also called prime numbers, that is, positive integers that can only be divisible by 1 and itself, such as 2, 3, 5, 7, etc. And 2 is the only even prime number; On the contrary, besides 1 and itself, at least the number of 1 is divisible, such as 4, 9, 12 and so on. If a number is divisible by another number, this number is called the divisor of another number, which can also be said to be its factor.

Different in nature:

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.

6. Among all prime numbers greater than 10, the single digits are only 1, 3, 7, 9.