Q: Is 857,980 a Prime Number?
A: No, 857,980 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 857980 can be evenly divided by 1 2 4 5 10 20 42,899 85,798 171,596 214,495 428,990 and 857,980, with no remainder.
Since 857,980 cannot be divided by just 1 and 857,980, it is not a prime number.