Final answer:
The denominator of a fraction is a factor of the numerator if the numerator can be divided evenly by the denominator without a remainder.
Step-by-step explanation:
In mathematics, the denominator of a fraction is the number below the line, which represents the total number of equal parts in the whole. The numerator is the number above the line, which represents the number of parts being considered.
If the denominator is a factor of the numerator, it means that the numerator can be divided evenly by the denominator without a remainder. In other words, the numerator is divisible by the denominator.
For example, in the fraction 6/3, the denominator (3) is a factor of the numerator (6) because 6 ÷ 3 = 2 with no remainder.