For this case what we must do is use a base as a number and an exponent.
We must write an expression of the form:

Where,
b: base
a: exponent
We then have the following number:

We can write the number as:

By definition we have:
In the multiplication, if we have the same base, the exponents are added:

Answer:
A number that should have used as the exponent is:
5