Q: Is 551,420 a Prime Number?
A: No, 551,420 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 551420 can be evenly divided by 1 2 4 5 10 20 79 158 316 349 395 698 790 1,396 1,580 1,745 3,490 6,980 27,571 55,142 110,284 137,855 275,710 and 551,420, with no remainder.
Since 551,420 cannot be divided by just 1 and 551,420, it is not a prime number.