Q: Is 278,420 a Prime Number?
A: No, 278,420 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 278420 can be evenly divided by 1 2 4 5 10 20 13,921 27,842 55,684 69,605 139,210 and 278,420, with no remainder.
Since 278,420 cannot be divided by just 1 and 278,420, it is not a prime number.