Primes lie at the core of Number Theory. There are tons of amazing facts about them. Many important theorems have been proven about them. Many others defy proof (and hold back number theory because of it), etc. Take any elementary algebra course and you will begin to learn about primes. Ten years later as you are finishing up your PhD in mathematics, it’s likely you will STILL be learning things about them.
Yeah, like I learned that some people are superstitious about the number 13 by reading the article. I think in Asian cultures they are superstitious about the number 4 so what’s the prime significance there?