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Any number that ends with 5 is a multiple of 5.
6x4x2
The simplest answer is 1 and 28. There are an infinite number of pairs that can be multiplied together to make 28, and an infinite number of triplets, quads, etc.
(15,3)(9,5)
43 is a prime number. So, 43 can only be produced as a product of 1 times 43.