Q: Is 278,428 a Prime Number?
A: No, 278,428 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 278428 can be evenly divided by 1 2 4 47 94 188 1,481 2,962 5,924 69,607 139,214 and 278,428, with no remainder.
Since 278,428 cannot be divided by just 1 and 278,428, it is not a prime number.