Q: Is 643,120 a Prime Number?
A: No, 643,120 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 643120 can be evenly divided by 1 2 4 5 8 10 16 20 40 80 8,039 16,078 32,156 40,195 64,312 80,390 128,624 160,780 321,560 and 643,120, with no remainder.
Since 643,120 cannot be divided by just 1 and 643,120, it is not a prime number.