Q: Is 278,858 a Prime Number?
A: No, 278,858 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 278858 can be evenly divided by 1 2 139,429 and 278,858, with no remainder.
Since 278,858 cannot be divided by just 1 and 278,858, it is not a prime number.