Q: Is 161,780 a Prime Number?
A: No, 161,780 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 161780 can be evenly divided by 1 2 4 5 10 20 8,089 16,178 32,356 40,445 80,890 and 161,780, with no remainder.
Since 161,780 cannot be divided by just 1 and 161,780, it is not a prime number.