A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5361840 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 30 33 36 40 44 45 48 55 60 66 72 80 88 90 99 110 120 132 144 165 176 180 198 220 240 264 330 360 396 440 495 528 660 677 720 792 880 990 1,320 1,354 1,584 1,980 2,031 2,640 2,708 3,385 3,960 4,062 5,416 6,093 6,770 7,447 7,920 8,124 10,155 10,832 12,186 13,540 14,894 16,248 20,310 22,341 24,372 27,080 29,788 30,465 32,496 37,235 40,620 44,682 48,744 54,160 59,576 60,930 67,023 74,470 81,240 89,364 97,488 111,705 119,152 121,860 134,046 148,940 162,480 178,728 223,410 243,720 268,092 297,880 335,115 357,456 446,820 487,440 536,184 595,760 670,230 893,640 1,072,368 1,340,460 1,787,280 2,680,920 and 5,361,840, with no remainder.
Since 5,361,840 cannot be divided by just 1 and 5,361,840, it is not a prime number.