Q: Is 856,580 a Prime Number?
A: No, 856,580 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 856580 can be evenly divided by 1 2 4 5 10 20 42,829 85,658 171,316 214,145 428,290 and 856,580, with no remainder.
Since 856,580 cannot be divided by just 1 and 856,580, it is not a prime number.