Q: Is 643,724 a Prime Number?
A: No, 643,724 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 643724 can be evenly divided by 1 2 4 23 46 92 6,997 13,994 27,988 160,931 321,862 and 643,724, with no remainder.
Since 643,724 cannot be divided by just 1 and 643,724, it is not a prime number.