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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.
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