Q: Is 209,780 a Prime Number?
A: No, 209,780 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 209780 can be evenly divided by 1 2 4 5 10 17 20 34 68 85 170 340 617 1,234 2,468 3,085 6,170 10,489 12,340 20,978 41,956 52,445 104,890 and 209,780, with no remainder.
Since 209,780 cannot be divided by just 1 and 209,780, it is not a prime number.