Q: Is 1,637,643 a Prime Number?
A: No, 1,637,643 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 1637643 can be evenly divided by 1 3 7 21 77,983 233,949 545,881 and 1,637,643, with no remainder.
Since 1,637,643 cannot be divided by just 1 and 1,637,643, it is not a prime number.