Q: Is 551,321 a Prime Number?
A: Yes, 551,321 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 551321 can be evenly divided by 1 and 551,321, with no remainder.
Since 551,321 can be divided by just 1 and 551,321, it is a prime number.