A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3485160 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 18 20 21 24 27 28 30 35 36 40 42 45 54 56 60 63 70 72 84 90 105 108 120 126 135 140 168 180 189 210 216 252 270 280 315 360 378 420 461 504 540 630 756 840 922 945 1,080 1,260 1,383 1,512 1,844 1,890 2,305 2,520 2,766 3,227 3,688 3,780 4,149 4,610 5,532 6,454 6,915 7,560 8,298 9,220 9,681 11,064 12,447 12,908 13,830 16,135 16,596 18,440 19,362 20,745 24,894 25,816 27,660 29,043 32,270 33,192 38,724 41,490 48,405 49,788 55,320 58,086 62,235 64,540 77,448 82,980 87,129 96,810 99,576 116,172 124,470 129,080 145,215 165,960 174,258 193,620 232,344 248,940 290,430 348,516 387,240 435,645 497,880 580,860 697,032 871,290 1,161,720 1,742,580 and 3,485,160, with no remainder.
Since 3,485,160 cannot be divided by just 1 and 3,485,160, it is not a prime number.