Q: Is 1,643,634 a Prime Number?
A: No, 1,643,634 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 1643634 can be evenly divided by 1 2 3 6 9 18 127 254 381 719 762 1,143 1,438 2,157 2,286 4,314 6,471 12,942 91,313 182,626 273,939 547,878 821,817 and 1,643,634, with no remainder.
Since 1,643,634 cannot be divided by just 1 and 1,643,634, it is not a prime number.