Originally posted by Cynog Ap Brychan Yes: 2 itself is a prime. The definition of a prime is a number that may only be divided by 1 and itself. But having been taught that 2 is the only even prime number, I'm not at all sure (sorry to go off tack).
(I would feel worse about going off track if this thread wasn't so wacky already!
) You say, correctly, "The definition of a prime is a number that may only be divided by 1 and itself". And just before, you acknowledged that 0 is divisible by 2. So, being divisible by 1, 2 and itself, it already isn't a prime. In fact, it is also divisible by 3. And by 4. By 5 too, actually. Oh, and a couple more.
So 0 is not a prime: No more than the posted photo is a Pentax k-3 (Did you notice how very subtly I managed to get the thread back on track?
).