Q: Is 255,420 a Prime Number?
A: No, 255,420 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 255420 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 15 18 20 22 27 30 33 36 43 44 45 54 55 60 66 86 90 99 108 110 129 132 135 165 172 180 198 215 220 258 270 297 330 387 396 430 473 495 516 540 594 645 660 774 860 946 990 1,161 1,188 1,290 1,419 1,485 1,548 1,892 1,935 1,980 2,322 2,365 2,580 2,838 2,970 3,870 4,257 4,644 4,730 5,676 5,805 5,940 7,095 7,740 8,514 9,460 11,610 12,771 14,190 17,028 21,285 23,220 25,542 28,380 42,570 51,084 63,855 85,140 127,710 and 255,420, with no remainder.
Since 255,420 cannot be divided by just 1 and 255,420, it is not a prime number.