Why do prime numbers seem to get less frequent as you go larger into numbers?

Answer 1

This is not an easy question to answer, but you are correct that primes become less dense as you look at larger numbers.

One way I intuitively think of this is, take a number like 10, and compare it to one like
500000000, the smaller number certainly has fewer potential factors than the larger one.
In other words, as the numbers get larger, many of them will have many more possible factors.
Some will still have only 1 and themselves, or perhaps 3 or 4 factors, but in general, there are more factors. This is NOT a mathematical argument, just a way to think about the idea.