Q: Is 121,555 a Prime Number?
A: No, 121,555 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 121555 can be evenly divided by 1 5 7 23 35 115 151 161 755 805 1,057 3,473 5,285 17,365 24,311 and 121,555, with no remainder.
Since 121,555 cannot be divided by just 1 and 121,555, it is not a prime number.