Natural number refers to the number used to measure the number of things or to indicate the order of things. That is, the number 0, 1, 2, 3, 4 represents the number. Next, share the meaning and classification of natural numbers.

The meaning of natural numbers Natural numbers refer to numbers representing the number of objects, that is, starting from 0,0, 1, 2,3,4, ... one after another, forming an infinite group, that is, a non-negative integer.

Natural numbers start from 0, one by one, forming an infinite group. Natural numbers are ordered and infinite. Divided into even and odd numbers, composite numbers and prime numbers.

Natural numbers are what we often call positive integers and 0. Integers include natural numbers, so natural numbers must be integers and non-negative integers.

Natural numbers are integers (including positive integers and zero), but not all integers are natural numbers, such as-1, -2, -3. They are integers, not natural numbers. Natural numbers are infinite.

The classification of natural numbers (1) can be divided into odd numbers and even numbers according to whether they are even numbers.

1. Odd number

Odd number refers to a number that is not divisible by 2, also called odd number. The mathematical expression is 2n+ 1. Odd numbers can be divided into positive and negative odd numbers.

2. Even numbers

Even number refers to an integer divisible by 2, also called even number. The mathematical expression is 2n.

(2) According to the number of factors, it can be divided into prime number, composite number, 1 and 0.

1. prime number

A prime number is a natural number that has no other factors except 1 and itself.

2. Total number

A composite number refers to a natural number that can be divisible by other numbers (except 0) except 1 and itself.

3. 1

There are only 1 factors. It is neither a prime number nor a composite number.

4.0

Like 1, it is neither prime nor composite.