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No. If you multiply any numbers, those numbers are factors of whatever product you get. Therefore, this product is a composite number; it has atleast the two factors you multiplyed before. Compposite numbers are never prime. If the two factors above were prime, you would still end up with a composite number. For example: 3 times 5 equals 15. The factors of 15 are 1, 3, 5, and 15. 15 is composite. 7 time 51 equals 357. The factors of 357 are 1, 7, 51, and 357. 357 is composite.
3
(15 x 1) + (15 x 3) = 15 x 4 = 60
0, for example.
That means that if you perform a division sum with the number and its factor, the result would be an integer. For example, 15 is divisible by 1, 3, 5 and 15. 15/3 = 5, 15/5 = 3.