Decompose prime factors:
1) Each composite number can be written in the form of multiplying several prime numbers, where each prime number is a factor of the composite number, which is called the decomposition prime factor of the composite number
2) If the composite number is 10, you can write 2*5 prime numbers to multiply, 2, 5 is the decomposing prime factor of 10.
3) Composite number refers to the number that can be divisible by other numbers except 1 and itself, such as 4, 6, 8, 9, etc.
4) Prime numbers refer to numbers that can only be divisible by 1 and itself, but not by other numbers, such as 2, 5, 11, 13, etc.