Q: Is 505,791 a Prime Number?
A: No, 505,791 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 505791 can be evenly divided by 1 3 9 11 13 27 33 39 99 117 131 143 297 351 393 429 1,179 1,287 1,441 1,703 3,537 3,861 4,323 5,109 12,969 15,327 18,733 38,907 45,981 56,199 168,597 and 505,791, with no remainder.
Since 505,791 cannot be divided by just 1 and 505,791, it is not a prime number.