Possible, but, not likely
15
No.
The largest integer that is not the product of two or more different primes would be the largest prime number. Because there are an infinite number of prime numbers, there is no largest integer that is not the product of two or more different primes.
Usually not. The manufacturer plans how many units to produce and then needs to ensure that the company has the correct number of components, the correct amount of labour input and so on.
Manufacturing production is always carefully worked out. Based on such things as demand, costs, etc. So production would not be a random number.
If the signs of both numbers are the same, the product will be positive. If the signs of the numbers are different, the product will be negative.
216
36.
No.
4 and 14
30
No, two.