Prime number and composite number calculator

Composite number, also known as composite number, is a positive integer greater than 1 that satisfies any of the following (equivalent) conditions:

1. It is the product of two integers greater than 1;

2. It has at least three positive factors;

3. It is a non-prime number with at least one prime factor.

4. The product of two or more prime numbers can form a composite number, and can only form a composite number. Conversely, a composite number can be decomposed into the product of a group of prime numbers, and can only be decomposed into the product of a group of prime numbers.

5. A positive integer other than 1 that is not a prime number is a composite number.

A number that has other positive factors besides 1 and itself

Note: "0" and "1" are neither prime numbers nor composite numbers.

Natural numbers with only two positive factors, 1 and itself, are called prime numbers (or prime numbers). (For example, from 2÷1=2, 2÷2=1, we know that the only factors of 2 are 1 and itself 2, so 2 is a prime number. The opposite is composite numbers: "Numbers with other factors besides 1 and itself are called composite numbers." For example, 4÷1=4, 4÷2=2, 4÷4=1. Obviously, besides 1 and itself 4, 4 also has the factor 2, so 4 is a composite number.)

The prime numbers within 100 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97. There are 25 prime numbers within 100.