Q: Is 257,440 a Prime Number?
A: No, 257,440 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 257440 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 80 160 1,609 3,218 6,436 8,045 12,872 16,090 25,744 32,180 51,488 64,360 128,720 and 257,440, with no remainder.
Since 257,440 cannot be divided by just 1 and 257,440, it is not a prime number.