Q: Is 643,040 a Prime Number?
A: No, 643,040 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 643040 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 80 160 4,019 8,038 16,076 20,095 32,152 40,190 64,304 80,380 128,608 160,760 321,520 and 643,040, with no remainder.
Since 643,040 cannot be divided by just 1 and 643,040, it is not a prime number.