Q: Is 551,604 a Prime Number?
A: No, 551,604 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 551604 can be evenly divided by 1 2 3 4 6 12 43 86 129 172 258 516 1,069 2,138 3,207 4,276 6,414 12,828 45,967 91,934 137,901 183,868 275,802 and 551,604, with no remainder.
Since 551,604 cannot be divided by just 1 and 551,604, it is not a prime number.