ANSWER
False, that is a mixed number
EXPLANATION
A proper fraction is a fraction where the denominator is greater than the numerator. On the other hand, an improper fraction is a fraction where the denominator is less than the numerator.
If we put a whole number and a proper fraction together we don't get an improper fraction unless we add those two numbers. Instead we'd have a mixed number.
For example:
[tex]3\frac{3}{5}\rightarrow\text{ mixed number}[/tex]If we add the whole number and the proper fraction:
[tex]3+\frac{3}{5}=\frac{3\cdot5+3}{5}=\frac{15+3}{5}=\frac{18}{5}[/tex]We get an improper fraction.
Therefore, the given statement is false.