Q: Is 427,780 a Prime Number?
A: No, 427,780 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 427780 can be evenly divided by 1 2 4 5 10 20 73 146 292 293 365 586 730 1,172 1,460 1,465 2,930 5,860 21,389 42,778 85,556 106,945 213,890 and 427,780, with no remainder.
Since 427,780 cannot be divided by just 1 and 427,780, it is not a prime number.