A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1893360 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 23 24 28 30 35 40 42 46 48 49 56 60 69 70 80 84 92 98 105 112 115 120 138 140 147 161 168 184 196 210 230 240 245 276 280 294 322 336 343 345 368 392 420 460 483 490 552 560 588 644 686 690 735 784 805 840 920 966 980 1,029 1,104 1,127 1,176 1,288 1,372 1,380 1,470 1,610 1,680 1,715 1,840 1,932 1,960 2,058 2,254 2,352 2,415 2,576 2,744 2,760 2,940 3,220 3,381 3,430 3,864 3,920 4,116 4,508 4,830 5,145 5,488 5,520 5,635 5,880 6,440 6,762 6,860 7,728 7,889 8,232 9,016 9,660 10,290 11,270 11,760 12,880 13,524 13,720 15,778 16,464 16,905 18,032 19,320 20,580 22,540 23,667 27,048 27,440 31,556 33,810 38,640 39,445 41,160 45,080 47,334 54,096 63,112 67,620 78,890 82,320 90,160 94,668 118,335 126,224 135,240 157,780 189,336 236,670 270,480 315,560 378,672 473,340 631,120 946,680 and 1,893,360, with no remainder.
Since 1,893,360 cannot be divided by just 1 and 1,893,360, it is not a prime number.