Q: Is 257,240 a Prime Number?
A: No, 257,240 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 257240 can be evenly divided by 1 2 4 5 8 10 20 40 59 109 118 218 236 295 436 472 545 590 872 1,090 1,180 2,180 2,360 4,360 6,431 12,862 25,724 32,155 51,448 64,310 128,620 and 257,240, with no remainder.
Since 257,240 cannot be divided by just 1 and 257,240, it is not a prime number.