A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1753920 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 27 28 29 30 32 35 36 40 42 45 48 54 56 58 60 63 64 70 72 80 84 87 90 96 105 108 112 116 120 126 135 140 144 145 160 168 174 180 189 192 203 210 216 224 232 240 252 261 270 280 288 290 315 320 336 348 360 378 406 420 432 435 448 464 480 504 522 540 560 576 580 609 630 672 696 720 756 783 812 840 864 870 928 945 960 1,008 1,015 1,044 1,080 1,120 1,160 1,218 1,260 1,305 1,344 1,392 1,440 1,512 1,566 1,624 1,680 1,728 1,740 1,827 1,856 1,890 2,016 2,030 2,088 2,160 2,240 2,320 2,436 2,520 2,610 2,784 2,880 3,024 3,045 3,132 3,248 3,360 3,480 3,654 3,780 3,915 4,032 4,060 4,176 4,320 4,640 4,872 5,040 5,220 5,481 5,568 6,048 6,090 6,264 6,496 6,720 6,960 7,308 7,560 7,830 8,120 8,352 8,640 9,135 9,280 9,744 10,080 10,440 10,962 12,096 12,180 12,528 12,992 13,920 14,616 15,120 15,660 16,240 16,704 18,270 19,488 20,160 20,880 21,924 24,360 25,056 27,405 27,840 29,232 30,240 31,320 32,480 36,540 38,976 41,760 43,848 48,720 50,112 54,810 58,464 60,480 62,640 64,960 73,080 83,520 87,696 97,440 109,620 116,928 125,280 146,160 175,392 194,880 219,240 250,560 292,320 350,784 438,480 584,640 876,960 and 1,753,920, with no remainder.
Since 1,753,920 cannot be divided by just 1 and 1,753,920, it is not a prime number.