PS - what's a prime?

I apologize for my lack of discernment in the last post about what qualifies as general knowledge and what I know because I spent years studying mathematics.

So what are primes you ask (no, you're not the only one who was wondering)?

**In this post, for simplicity's sake, I use the term "number" to refer to positive integers, i.e. 1, 2, 3, 4, and the whole gang -- we're not paying attention to those with decimals or negatives or any of those crowds.**

A prime number is a number that can only be divided by itself or 1. So 2 is a prime number. In fact, 2 is the only even prime, since all other even numbers can be divided by 2.
Then 3 is a prime.
4? NO!!! because 4 = 2 x 2
5? check, it's a prime.
6 = 2 x 3 so no!
7 is a prime.
8 = 2 x 2 x 2 (or 2 x 4). NO PRIME FOR YOU!
9 = 3 x 3. No prime here.
10 = 2 x 5. Not a prime.
11 -- It's a prime!!
12 = 2 x 2 x 3 (= 3 x 4 = 2 x 6). Definitely not a prime.
So you get the idea?
The first 15 primes are: 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43.
I won't tell you what the largest primes are, because the one they just discovered in the past month has 17,425,170 digits. So yeah, I don't have the time to post it right now.

So there you have it. This hopefully gives you the basic information needed to read through the post below. Let me know if you would like any other mathematical clarification!