Is 19 a factor or a multiple number?

Answer 1

19 can be both the factor of another number and a multiple.

For example, 19 is a multiple of 1 (1 x 19 = 19). This is the only example of where 19 is a multiple of an integer (as 19 is prime).

An example of 19 being a factor is when looking at the number 38. 2x19=38, therefore 19 is a factor of 38. There are many numbers (infinitely many) which have 19 as a factor.