1 is not prime, by definition. 2 is an unnatural prime, 4 is an unnatural prime, and 6 is an unnatural prime. All other natural primes cannot be unnatural primes.
I hope baseball doesn't get to the point where everyone's saying, 'He takes it [steroids]. He takes it. He takes it!' because not all of us do. I've been big my whole life, and I'll always be big. That's all natural.