Q: Is 321,345 a Prime Number?
A: No, 321,345 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 321345 can be evenly divided by 1 3 5 9 15 37 45 111 185 193 333 555 579 965 1,665 1,737 2,895 7,141 8,685 21,423 35,705 64,269 107,115 and 321,345, with no remainder.
Since 321,345 cannot be divided by just 1 and 321,345, it is not a prime number.