Integer notation is associated with computer mathematics, in which numbers can be in two forms: fixed point and floating point. Fixed point numbers are integers, and in computers represented in binary form. For example, if the number you want to represent is a whole number, say 123456, that is an integer notation. What about fractional part or decimal representation? What if I wanted to represent the number 1234.56? In that case we consider the number to have a decimal point two locations from the right, and all numbers that we deal with in that program are assumed to have that decimal location. Because that decimal point is always in the same place, this is called "fixed point" notation, which is also called integer notation.
The alternate representation is "floating point" and is analagous to scientific notation. The number is is written in two parts. One is the mantissa and the other the exponent. a*10^b.
Integer notation is precise but has limited range based on the number of digits allowed in the number. Floating point has a much broader range of values that it can represent: for example a two (decimal) digit exponent can represent a range of 10^99, while a 10 digit integer only a range of 10^10.
So lI would say that if you gave your answer as a whole number or a whole number with a fixed number of decimal places, you did it right. If you used scientific or floating point representation, that would not be what was asked for.