Q: Is 255,255 a Prime Number?
A: No, 255,255 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 255255 can be evenly divided by 1 3 5 7 11 13 15 17 21 33 35 39 51 55 65 77 85 91 105 119 143 165 187 195 221 231 255 273 357 385 429 455 561 595 663 715 935 1,001 1,105 1,155 1,309 1,365 1,547 1,785 2,145 2,431 2,805 3,003 3,315 3,927 4,641 5,005 6,545 7,293 7,735 12,155 15,015 17,017 19,635 23,205 36,465 51,051 85,085 and 255,255, with no remainder.
Since 255,255 cannot be divided by just 1 and 255,255, it is not a prime number.