Q: Is 551,643 a Prime Number?
A: No, 551,643 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 551643 can be evenly divided by 1 3 183,881 and 551,643, with no remainder.
Since 551,643 cannot be divided by just 1 and 551,643, it is not a prime number.