Q: Is 1,643,409 a Prime Number?
A: No, 1,643,409 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 1643409 can be evenly divided by 1 3 9 27 81 243 6,763 20,289 60,867 182,601 547,803 and 1,643,409, with no remainder.
Since 1,643,409 cannot be divided by just 1 and 1,643,409, it is not a prime number.