Q: Is 3,990 a Prime Number?
A: No, 3,990 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3990 can be evenly divided by 1 2 3 5 6 7 10 14 15 19 21 30 35 38 42 57 70 95 105 114 133 190 210 266 285 399 570 665 798 1,330 1,995 and 3,990, with no remainder.
Since 3,990 cannot be divided by just 1 and 3,990, it is not a prime number.