Q: Is 521,140 a Prime Number?
A: No, 521,140 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 521140 can be evenly divided by 1 2 4 5 10 20 71 142 284 355 367 710 734 1,420 1,468 1,835 3,670 7,340 26,057 52,114 104,228 130,285 260,570 and 521,140, with no remainder.
Since 521,140 cannot be divided by just 1 and 521,140, it is not a prime number.