Q: Is 877,561 a Prime Number?
A: No, 877,561 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 877561 can be evenly divided by 1 439 1,999 and 877,561, with no remainder.
Since 877,561 cannot be divided by just 1 and 877,561, it is not a prime number.