Q: Is 355,215 a Prime Number?
A: No, 355,215 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 355215 can be evenly divided by 1 3 5 7 15 17 21 35 51 85 105 119 199 255 357 595 597 995 1,393 1,785 2,985 3,383 4,179 6,965 10,149 16,915 20,895 23,681 50,745 71,043 118,405 and 355,215, with no remainder.
Since 355,215 cannot be divided by just 1 and 355,215, it is not a prime number.