All fractions can be labelled on a number line.
by looking at the denominator
Integers are positive and/or negative numbers. Fractions are not integers because they are not originally positive or negative. However, they can both be put on a number line and be considered an integer. Fractions aren't integers unless put on a number line. Integers don't have to be on a number line to be considered an integer.
It will be easier to know what to write
i think it goes on forever
As the denominator increases the fraction will be smaller but there is no limit to how tiny that fraction can be. So between any two numbers on the number line, you can have an infinite number of fractions.
38 is not a fraction.
You draw each of the fractions on the number line, and see which one is more to the right, i.e., greater. Please note that plotting the exact position of fractions this way is a bit imprecise - it is more exact to convert the fractions to a common denominator.