Q: Is 257,420 a Prime Number?
A: No, 257,420 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 257420 can be evenly divided by 1 2 4 5 10 20 61 122 211 244 305 422 610 844 1,055 1,220 2,110 4,220 12,871 25,742 51,484 64,355 128,710 and 257,420, with no remainder.
Since 257,420 cannot be divided by just 1 and 257,420, it is not a prime number.