Any numbers being multiplied by each other are called factors. The solution to a multiplication problem is called a product. Because of the commutative property of multiplicat … ion both numbers being multiplied together are called factors.. This is why - 3 x 5 = 15 5 x 3 = 15 It doesn't matter the order of the 3 or the 5. They are both called factors, and the product is the answer, 15.