No.
102.
No. 15 is the product of two prime numbers: 3 and 5
How about: 2*3*5 = 30 which is the product of the 1st three prime numbers
30
Since there are infinitely many primes, there are infinitely many numbers that are products of 3 primes.
30
30, 42, 66, 70, 78
Food doesn't exactly have model numbers but the food has a number to identify what product it is.
15
No.
The product of negative number and a positive number is always a negative. The product of two positive numbers, or two negative numbers, is always a positive.
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.