Question

A number that is formed by repeated multiplication by the same factor is a

Answer 1

Your Question:
A number that is formed by repeated multiplication by the same factor is a(n)___.
My Answer:
If a number is multiplied by the same number "x" number of times, it would result in an Exponent; a quantity representing the power to which a given number or expression is to be raised. 
Example:
5² = 5 • 5.
Hope I helped you, 
♥ James.