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I don't think it's specific to "the prime-enthusiast community". Most people would look at you oddly if you claimed that 3 is a five-digit number.

On the flip side, many people here would claim that 0x00000003 is an eight digit number.

Only to win an argument by nitpick golfing. In everyday serious conversation that’s a 4-byte number, not an 8-digit number.