What is a prime number? What is a prime number?

Prime number is a concept in mathematics, that is, two or more non-zero natural numbers whose common factor is only 1 are called prime numbers. For example, 2 and 3, the common factor is only 1, so they are prime numbers. The "two numbers" mentioned here refer to all natural numbers except 0, and the common factor is only 1, which cannot be mistaken for no common factor. Ordinary prime number:

1, 1 and any nonzero natural number are prime numbers.

2, 2 and any odd number are prime numbers.

3. Two adjacent nonzero natural numbers are prime numbers.

4. Two adjacent odd numbers are prime numbers.

5. Any two prime numbers are prime numbers.

6. Prime numbers are composite numbers, and numbers whose composite numbers are not prime numbers must be prime numbers.