A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4648140 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 17 18 20 21 28 30 31 34 35 36 42 45 49 51 60 62 63 68 70 84 85 90 93 98 102 105 119 124 126 140 147 153 155 170 180 186 196 204 210 217 238 245 252 255 279 294 306 310 315 340 357 372 420 434 441 465 476 490 510 527 558 588 595 612 620 630 651 714 735 765 833 868 882 930 980 1,020 1,054 1,071 1,085 1,116 1,190 1,260 1,302 1,395 1,428 1,470 1,519 1,530 1,581 1,666 1,764 1,785 1,860 1,953 2,108 2,142 2,170 2,205 2,380 2,499 2,604 2,635 2,790 2,940 3,038 3,060 3,162 3,255 3,332 3,570 3,689 3,906 4,165 4,284 4,340 4,410 4,557 4,743 4,998 5,270 5,355 5,580 6,076 6,324 6,510 7,140 7,378 7,497 7,595 7,812 7,905 8,330 8,820 9,114 9,486 9,765 9,996 10,540 10,710 11,067 12,495 13,020 13,671 14,756 14,994 15,190 15,810 16,660 18,228 18,445 18,972 19,530 21,420 22,134 22,785 23,715 24,990 25,823 27,342 29,988 30,380 31,620 33,201 36,890 37,485 39,060 44,268 45,570 47,430 49,980 51,646 54,684 55,335 66,402 68,355 73,780 74,970 77,469 91,140 94,860 103,292 110,670 129,115 132,804 136,710 149,940 154,938 166,005 221,340 232,407 258,230 273,420 309,876 332,010 387,345 464,814 516,460 664,020 774,690 929,628 1,162,035 1,549,380 2,324,070 and 4,648,140, with no remainder.
Since 4,648,140 cannot be divided by just 1 and 4,648,140, it is not a prime number.