The Loneliest Number, or Not?

According to this, the Greeks had quite a debate about whether 1 and certainly 0 were actually numbers. Some even weren't sure about 2's status.

I'm glad these days we've resolved those questions for ourselves. But it does make you marvel at the diversity of perceptions that can exist in people heads. Some Greek people actually didn't think that 2 was a number, while I literally cannot even imagine (I've been trying for a whole 5 minutes) to think of it as anything else.

The Loneliest Number, or Not?