What is a prime number and what is a prime number?

A prime number is a natural number that has no other factors except 1 and itself. Prime numbers are also called prime numbers. A natural number greater than 1 cannot be divisible by other natural numbers except 1 and itself, and is called a prime number; Otherwise it is called a composite number.

Prime number is a concept in mathematics, that is, the common factor of two or more integers is only 1.

Prime numbers have the following theorems:

(1) Two nonzero natural numbers whose common factor is only 1 are called prime numbers; For example: 2 and 3, the common factor is only 1, which is a prime number;

(2) A positive integer whose greatest common factor is only 1 is called a prime number;

(3) Two different prime numbers are coprime numbers;

(4) 1 is coprime with any natural number. Two different prime numbers are coprime. A prime number and a composite number are coprime when they are not multiples. The coprime of two complex numbers without the same prime factor;

(5) Any two adjacent numbers are coprime;

(6) The probability that two positive integers are prime numbers (the greatest common divisor is 1) is 6/π 2.