Q: Is 257,480 a Prime Number?
A: No, 257,480 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 257480 can be evenly divided by 1 2 4 5 8 10 20 40 41 82 157 164 205 314 328 410 628 785 820 1,256 1,570 1,640 3,140 6,280 6,437 12,874 25,748 32,185 51,496 64,370 128,740 and 257,480, with no remainder.
Since 257,480 cannot be divided by just 1 and 257,480, it is not a prime number.