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prime numbers
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# prime numbers

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```Prime Numbers

Definition

A prime number can be divided, without a remainder, only
by itself and by 1. For example:

17 can be divided only by 17 and by 1.

Some facts:

1. The only even prime number is 2. All other even numbers
can be divided by 2.
2. If the sum of a number's digits is a multiple of 3, that
number can be divided by 3.
3. No prime number greater than 5 ends in a 5. Any number
greater than 5 that ends in a 5 can be divided by 5.
4. Zero and 1 are not considered prime numbers.
5. Except for 0 and 1, a number is either a prime number or
a composite number. A composite number is defined as any
number, greater than 1, that is not prime.

To prove whether a number is a prime number, first try dividing
it by 2, and see if you get a whole number. If you do, it can't
be a prime number. If you don't get a whole number, next try
dividing it by prime numbers: 3, 5, 7, 11 (9 is divisible by 3)
and so on, always dividing by a prime number.
```

## Prime Numbers Checker

Please enter a number to see if it's prime:

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