No, 9/9 is not considered an improper fraction. An improper fraction is defined as a fraction where the numerator (the top number) is greater than or equal to the denominator (the bottom number).
In the case of 9/9, the numerator and denominator are equal. When you divide 9 by 9, you get 1, which is a whole number. Therefore, 9/9 is a whole number and can also be written as 1. While it fits the definition of having a numerator that is not less than the denominator, it is typically seen as a whole number rather than an improper fraction.