Is 15 a natural number

Answer 1

Yes, 15 is a natural number. Natural numbers are the set of positive integers starting from 1 and increasing by increments of 1 (1, 2, 3, 4, 5, ...). Since 15 is a positive integer and can be reached by counting up from 1, it is considered a natural number.

Answer 2

No. Natural numbers include the set of *non-negative* integers.

(An integer being the set of all numbers which have no decimal point. e.g. -1, 0, 1, 2, 3)

Answer 3

Yes

Answer 4

yes