Q: Is 855,564 a Prime Number?
A: No, 855,564 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 855564 can be evenly divided by 1 2 3 4 6 12 83 166 249 332 498 859 996 1,718 2,577 3,436 5,154 10,308 71,297 142,594 213,891 285,188 427,782 and 855,564, with no remainder.
Since 855,564 cannot be divided by just 1 and 855,564, it is not a prime number.