Q: Is 521,440 a Prime Number?
A: No, 521,440 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 521440 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 80 160 3,259 6,518 13,036 16,295 26,072 32,590 52,144 65,180 104,288 130,360 260,720 and 521,440, with no remainder.
Since 521,440 cannot be divided by just 1 and 521,440, it is not a prime number.