Prime number

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Prime numbers are irregular, odd and never quite what they appear to be; hence Prime Minister.

A prime number is a natural number with éxactly two (different) divisors.

It logically follows from this definition that these two divisors are the number 1 and the prime number itself. All other numbers are the offspring of prime numbers, since every other number can be achieved by a group of prime numbers multiplying with each other. There are two exceptions on this rule, namely 0 and 1. Well, 0 is worthless and 1 looks like your mother. So, serves them right. Oh, and -1 as well.

Two is the only even prime number. All the other prime numbers are odd. Really odd. They also have very strange habbits. Like smoking grass, because they can't afford real weed. Most mathematicians consider prime numbers to be the older, more responsible type of numbers, but the latter example shows clearly that they are wrong.

You can prove that each odd number (except for one, that useless loser) actually is a prime number. There are several proofs for this, including:

Physics - We see that 3, 5 and 7 are prime numbers. We then look at some random numbers. 17, 19, 37. Yup, they are all odd too. Therefore, all odd numbers are prime.

Mathematics - We see that 3 is a prime number, 5 is a prime number and 7 is a prime number too. With mathematical induction it now follows for all natural numbers that if they are odd, they are prime.

Advanced mathematics - This statement is left as an exercise for the reader.

Engineering - We see that 3 is a prime number, 5 is a prime number, 7 is a prime number, 9 is a prime number, 11 is a prime number, and so forth.

Programming - We see that 3 is a prime number, 5 is a prime number, 7 is a prime number, 7 is a prime number, 7 is a prime number, 7 is a prime number... and so on in an infinite loop.

Chemistry - Ok so, uhhh... what's a prime number again?

And if you want to take this a step further you could prove that all numbers are primes. Seeing that 2 is a prime and asking the question "What is a prime, anyway?", we see trivially that the answer yields 42. From this you could easily come to the conclusion that 42 / 2 * 2 = x, hence x is a prime.

Another way of looking at this would be;