GMAT Quantitative Reasoning Practice Test 4

A divisor is actually a factor of a number.
Check each of the answers individually:
124 is divisor of itself, but obviously he has no other divisors smaller than 124.
63 is a divisor of itself and 126, which is bigger than 124.
62 is on the limit, we were asked for divisors less than 124.
This is the right answer. 61 is a divisor of 61 and 122 .