Q: Is 255,840 a Prime Number?
A: No, 255,840 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 255840 can be evenly divided by 1 2 3 4 5 6 8 10 12 13 15 16 20 24 26 30 32 39 40 41 48 52 60 65 78 80 82 96 104 120 123 130 156 160 164 195 205 208 240 246 260 312 328 390 410 416 480 492 520 533 615 624 656 780 820 984 1,040 1,066 1,230 1,248 1,312 1,560 1,599 1,640 1,968 2,080 2,132 2,460 2,665 3,120 3,198 3,280 3,936 4,264 4,920 5,330 6,240 6,396 6,560 7,995 8,528 9,840 10,660 12,792 15,990 17,056 19,680 21,320 25,584 31,980 42,640 51,168 63,960 85,280 127,920 and 255,840, with no remainder.
Since 255,840 cannot be divided by just 1 and 255,840, it is not a prime number.