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In mathematics, how many numbers are there in the world, and what are they called?
1, 0, e, IX 2+ 1 = 0 "1" Yes.

natural number

Most basic

positive integer

: 1 is the smallest positive integer, the smallest.

Positive odd number

, is a ..

rational number

, yes

unidigit

, is also singular. 1 neither.

prime number

(

prime number

) not really.

composite number

. The first thing expressed through the unit. A whole consisting of one or several things can be regarded as the unit "1"