The Closure Property states that the product of two numbers in a given set will also be a member of that set. In the case of the product of 45 and 15:
45 × 15 = 675
Since both 45 and 15 are integers, and their product (675) is also an integer, we can conclude that the product of 45 and 15 is an integer.
If we consider other number sets, such as the set of real numbers, the product would also be classified as a real number. However, in the context of the Closure Property applied to integers, we specifically refer to 675 as an integer.