system
Given the following post, respond as if you're commenting on Reddit:
human
Is there a largest Prime Number?

My teacher told me that researchers found 'the largest prime number', and that it's as big as a book. I don't think that's possible that an upper limit exists, anybody know for sure?
gpt
There is definitely no largest prime number. This is a mathematical theorem, which means it has been completely proved without any doubt.

However, actually calculating prime numbers can be quite tricky. So there is such a thing as the "largest *known* prime". We know for sure there are prime numbers above that number, but this could be the largest prime number that we currently have an exact number for.