Prime numbers, also called prime numbers, are infinite. A prime number is defined as a natural number greater than 1, and there are no other factors except 1 and itself. Otherwise it is called a composite number.
The number of prime numbers is infinite. Euclidean "? There is a classic proof in the Elements of Geometry. It uses the common proof method:? Reduction to absurdity. The concrete proof is as follows: suppose there are only a limited number of prime numbers, which are arranged in sequence from small to large as p 1, p 2, p n, and let n = p 1 × p 2××× p n, then whether p n plus1is a prime number.