A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2387160 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 19 20 24 30 36 38 40 45 57 60 72 76 90 95 114 120 152 171 180 190 228 285 342 349 360 380 456 570 684 698 760 855 1,047 1,140 1,368 1,396 1,710 1,745 2,094 2,280 2,792 3,141 3,420 3,490 4,188 5,235 6,282 6,631 6,840 6,980 8,376 10,470 12,564 13,262 13,960 15,705 19,893 20,940 25,128 26,524 31,410 33,155 39,786 41,880 53,048 59,679 62,820 66,310 79,572 99,465 119,358 125,640 132,620 159,144 198,930 238,716 265,240 298,395 397,860 477,432 596,790 795,720 1,193,580 and 2,387,160, with no remainder.
Since 2,387,160 cannot be divided by just 1 and 2,387,160, it is not a prime number.