Exercise
The positive divisors of 24 are
2, 3, 4, 6, 8, 12, 24.
1, 2, 3, 4, 6, 8, 12, 24.
1, 2, 3, 4, 6, 8, 9, 12, 24.
How about 1? Try again.
Indeed, this is the complete set.
Does 9 really divide 24? Try again.
Exercise
The positive divisors of 24 are
2, 3, 4, 6, 8, 12, 24.
1, 2, 3, 4, 6, 8, 12, 24.
1, 2, 3, 4, 6, 8, 9, 12, 24.