What are prime numbers?

Numbers that can only be evenly (meaning the result is a whole number) by itself and the number 1.

Ex: 1, 3, 5, 7, 13, 17...

Hmm, adding to hheath's post,

a prime number is a number having only two integer (whole number) as factors.

They will include 2, 3, 5, 7, 11, 13, 17, 23, 29, 31, 37, 41, 43, 47, etc

The actual definition of a prime number is: "a natural number that has exactly two distinct natural number divisors." By using the term "natural numbers" rather than "integers" you avoid the confusion of whether negative numbers or 0 needs to be considered. Also note that 1 is not a prime number, because it does not have two distinct natural number divisors.

prime numbers are numbers that can only be multiplies and divided by itself! Composite numbers can be multiplied more than like just by 1 and itself like for example 18 is a composite number it can be multiplied 9x2 and 3x6 and more get it got it good

prime= multiply by 1 and itself only