Q: Is 561,580 a Prime Number?
A: No, 561,580 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 561580 can be evenly divided by 1 2 4 5 10 20 43 86 172 215 430 653 860 1,306 2,612 3,265 6,530 13,060 28,079 56,158 112,316 140,395 280,790 and 561,580, with no remainder.
Since 561,580 cannot be divided by just 1 and 561,580, it is not a prime number.