A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5332320 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 23 24 28 30 32 35 36 40 42 45 46 48 56 60 63 69 70 72 80 84 90 92 96 105 112 115 120 126 138 140 144 160 161 168 180 184 207 210 224 230 240 252 276 280 288 315 322 336 345 360 368 414 420 460 480 483 504 529 552 560 630 644 672 690 720 736 805 828 840 920 966 1,008 1,035 1,058 1,104 1,120 1,260 1,288 1,380 1,440 1,449 1,587 1,610 1,656 1,680 1,840 1,932 2,016 2,070 2,116 2,208 2,415 2,520 2,576 2,645 2,760 2,898 3,174 3,220 3,312 3,360 3,680 3,703 3,864 4,140 4,232 4,761 4,830 5,040 5,152 5,290 5,520 5,796 6,348 6,440 6,624 7,245 7,406 7,728 7,935 8,280 8,464 9,522 9,660 10,080 10,580 11,040 11,109 11,592 12,696 12,880 14,490 14,812 15,456 15,870 16,560 16,928 18,515 19,044 19,320 21,160 22,218 23,184 23,805 25,392 25,760 28,980 29,624 31,740 33,120 33,327 37,030 38,088 38,640 42,320 44,436 46,368 47,610 50,784 55,545 57,960 59,248 63,480 66,654 74,060 76,176 77,280 84,640 88,872 95,220 111,090 115,920 118,496 126,960 133,308 148,120 152,352 166,635 177,744 190,440 222,180 231,840 253,920 266,616 296,240 333,270 355,488 380,880 444,360 533,232 592,480 666,540 761,760 888,720 1,066,464 1,333,080 1,777,440 2,666,160 and 5,332,320, with no remainder.
Since 5,332,320 cannot be divided by just 1 and 5,332,320, it is not a prime number.