The sentence: Police police police police police police police police. Is an actual sentence.
3 is prime
31 is too
So is 331, 3331, 33331, 333331, 3333331, and 33333331 is also prime but 333333331 is the first in this series isn't prime as it's divisible by 17.
It's theorised that there isn't an infinite amount of prime numbers, even though there's an infinite amount of numbers, because the larger the number, the more things could possibly factor into it.