Except for 2 all odd number that have only two factors which are themselves and one are prime numbers such as: 3 5 7 11 13 17 19 23 29 ..... etc
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A number that is not a prime number is called a composite number because it can be made by multiplying prime numbers together. For example, 6 is a composite number that is the product of multiplying the prime numbers 2 and 3 together.
There are an infinite amount of prime numbers, as numbers never end. Prime numbers are numbers that are only divisible by 1 and itself. For example, 2, 3, 5, 53, and 97 are prime numbers.
All even numbers greater than two are composite.
All numbers have factors. Some factors are prime numbers. These are known as prime factors. 2 and 3 are prime factors of 6. 1 and 6 are not prime factors of 6.
All numbers have factors. Some factors are prime numbers. We call these prime factors. The factors of 6 are 1, 2, 3 and 6. The prime factors of 6 are 2 and 3.