Since there are infinitely many primes, there are infinitely many numbers that are products of 3 primes.
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102.
How about: 2*3*5 = 30 which is the product of the 1st three prime numbers
30
30, 42, 66, 70, 78
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.