Q: Is 551,605 a Prime Number?
A: No, 551,605 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 551605 can be evenly divided by 1 5 110,321 and 551,605, with no remainder.
Since 551,605 cannot be divided by just 1 and 551,605, it is not a prime number.