3 Answers

It’s actually neither.
A proper fraction is defined where the numerator is smaller than the denominator (e.g. 2/3)
An improper fraction is defined where the numerator is bigger than the denominator (e.g. 7/3)
13/13. It would be reduced to 1 as a whole number.

It would be considered improper. Proper fractions has the numerator being less than the denominator.
Since improper fractions can be turned into mixed numbers (whole number with the fraction component), they can also be turned into integers when they divide evenly, like your example. 13 / 13 = 1

improper