>>12799087>>12799173There are complicated primality definitions based on tests and patterns in math that exclude 1.
For example, if 1 was prime it would be different from all the other prime numbers in that it has no off sequence.
Every even number is divisible by 2
Every third number is divisible by 3.
But every number is divisible by 1, so there are no non-divisible-by-1 numbers, which would make it unique from the prime numbers in that aspect. There are many other things about 1 that make it not prime.
A prime is n > 1 that cannot be divided evenly by anything besides n and 1, and most of the groundbreaking work on prime numbers relies on this fact.
