Q: Is 1,578,420 a Prime Number?
A: No, 1,578,420 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 1578420 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 27 30 36 37 45 54 60 74 79 90 108 111 135 148 158 180 185 222 237 270 316 333 370 395 444 474 540 555 666 711 740 790 948 999 1,110 1,185 1,332 1,422 1,580 1,665 1,998 2,133 2,220 2,370 2,844 2,923 3,330 3,555 3,996 4,266 4,740 4,995 5,846 6,660 7,110 8,532 8,769 9,990 10,665 11,692 14,220 14,615 17,538 19,980 21,330 26,307 29,230 35,076 42,660 43,845 52,614 58,460 78,921 87,690 105,228 131,535 157,842 175,380 263,070 315,684 394,605 526,140 789,210 and 1,578,420, with no remainder.
Since 1,578,420 cannot be divided by just 1 and 1,578,420, it is not a prime number.