Base of a power
The base is the repeated factor. The exponent tells how many times the base is repeated.
To write repeated multiplication in an exponential notation, you should write the number that has to be multiplied as the base. Count the number of times that the number is used.
That's known as the base.
The factors of nine are one, three, and nine. A factor is a whole number that when multiplied by another number equals the number you are factoring. So, the repeated multiplication for nine is 3 times 3.
11 has no factors; it's a prime number.