A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3602940 can be evenly divided by 1 2 3 4 5 6 10 11 12 15 20 22 30 33 44 53 55 60 66 103 106 110 132 159 165 206 212 220 265 309 318 330 412 515 530 583 618 636 660 795 1,030 1,060 1,133 1,166 1,236 1,545 1,590 1,749 2,060 2,266 2,332 2,915 3,090 3,180 3,399 3,498 4,532 5,459 5,665 5,830 6,180 6,798 6,996 8,745 10,918 11,330 11,660 13,596 16,377 16,995 17,490 21,836 22,660 27,295 32,754 33,990 34,980 54,590 60,049 65,508 67,980 81,885 109,180 120,098 163,770 180,147 240,196 300,245 327,540 360,294 600,490 720,588 900,735 1,200,980 1,801,470 and 3,602,940, with no remainder.
Since 3,602,940 cannot be divided by just 1 and 3,602,940, it is not a prime number.