You have the following expression given in the exercise:
Notice that you must find the product, which is the result of a multiplication.
The exponent 2 of the base 10, indicates that you must multipy the base by itself twice. Knowing this, you get:
Therefore, simplifying the expression, this is:
To find the product you can just write two zeros after the digit 9, which is the same es multiply 539 by 100. So the answer is: