Q: Is 161,540 a Prime Number?
A: No, 161,540 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 161540 can be evenly divided by 1 2 4 5 10 20 41 82 164 197 205 394 410 788 820 985 1,970 3,940 8,077 16,154 32,308 40,385 80,770 and 161,540, with no remainder.
Since 161,540 cannot be divided by just 1 and 161,540, it is not a prime number.