One could be part of a factor pair.
One such factor pair is 10 and 80.
factor pair = 1512,1 factor pair = 756,2 factor pair = 504,3 factor pair = 378,4 factor pair = 252,6 factor pair = 216,7 factor pair = 189,8 factor pair = 168,9 factor pair = 126,12 factor pair = 108,14 factor pair = 84,18 factor pair = 72,21 factor pair = 63,24 factor pair = 56,27 factor pair = 54,28 factor pair = 42,36
That happens when one of the numbers is a factor of the other.
Numbers with more than one factor pair are composite numbers.
A number with only one factor pair is........ a prime number for example 11 the only factor pair is one times 11.
factor pair = 650,1 factor pair = 325,2 factor pair = 130,5 factor pair = 65,10 factor pair = 50,13 factor pair = 26,25
One only has one factor. If you have to, you can use (1,1)
The factor pair for 31 is 1*31. Since 31 is prime, it has only one factor pair.
factor pair = 36,1 factor pair = 18,2 factor pair = 12,3 factor pair = 9,4 factor pair = 6,6
factor pair = 90,1 factor pair = 45,2 factor pair = 30,3 factor pair = 18,5 factor pair = 15,6 factor pair = 10,9 Doctor Chuck Mathdoc
The factor pair of 13 is 1, 13. It only has one factor pair since it's a prime number.
Factor pairs are two numbers multiplied together to get one number. Examples: One factor pair of 24 is 4, 6. One factor pair of 70 is 5, 14. One factor pair of 144 is 12, 12.