Prime Number Calculator

1) Relation to multiples of 6: Every prime number greater than 3 is always one less or one more than a multiple of 6.
Example: `13697` is 1 less than `13698` (multiple of 6).

2) Square minus 1 divisible by 24: For every prime number greater than 3, if 1 is subtracted from its square, the result is always divisible by 24.
Example: The square of `13697` is `187607809`. Subtracting 1, we get `187607808`. Note that `187607808 ÷ 24 = 7816992`.

3) Difference of squares: Every prime number greater than 2 can be expressed as the difference of the squares of two consecutive natural numbers.
Example: `13697 = 6849^2 - 6848^2 = 46908801 - 46895104`

4) Sum of two squares: Every prime number of the form `4n+1` (where n is a positive natural number) can be expressed as the sum of two squares.
Example: `13697 = 76^2 + 89^2 = 5776 + 7921`, where `13697 = 4 × 3424 + 1`.

5) Form `4n+1` or `4n-1`: Except for the number 2, all prime numbers follow the pattern `4n+1` or `4n-1`, where `n` is a natural number.
Example: `13697` is of the form `4n+1`, where `n = 3424`.