Q: Is 3,978 a Prime Number?
A: No, 3,978 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 3978 can be evenly divided by 1 2 3 6 9 13 17 18 26 34 39 51 78 102 117 153 221 234 306 442 663 1,326 1,989 and 3,978, with no remainder.
Since 3,978 cannot be divided by just 1 and 3,978, it is not a prime number.