A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2169360 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 23 24 30 36 40 45 46 48 60 69 72 80 90 92 115 120 131 138 144 180 184 207 230 240 262 276 345 360 368 393 414 460 524 552 655 690 720 786 828 920 1,035 1,048 1,104 1,179 1,310 1,380 1,572 1,656 1,840 1,965 2,070 2,096 2,358 2,620 2,760 3,013 3,144 3,312 3,930 4,140 4,716 5,240 5,520 5,895 6,026 6,288 7,860 8,280 9,039 9,432 10,480 11,790 12,052 15,065 15,720 16,560 18,078 18,864 23,580 24,104 27,117 30,130 31,440 36,156 45,195 47,160 48,208 54,234 60,260 72,312 90,390 94,320 108,468 120,520 135,585 144,624 180,780 216,936 241,040 271,170 361,560 433,872 542,340 723,120 1,084,680 and 2,169,360, with no remainder.
Since 2,169,360 cannot be divided by just 1 and 2,169,360, it is not a prime number.