A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 758160 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 16 18 20 24 26 27 30 36 39 40 45 48 52 54 60 65 72 78 80 81 90 104 108 117 120 130 135 144 156 162 180 195 208 216 234 240 243 260 270 312 324 351 360 390 405 432 468 486 520 540 585 624 648 702 720 729 780 810 936 972 1,040 1,053 1,080 1,170 1,215 1,296 1,404 1,458 1,560 1,620 1,755 1,872 1,944 2,106 2,160 2,340 2,430 2,808 2,916 3,120 3,159 3,240 3,510 3,645 3,888 4,212 4,680 4,860 5,265 5,616 5,832 6,318 6,480 7,020 7,290 8,424 9,360 9,477 9,720 10,530 11,664 12,636 14,040 14,580 15,795 16,848 18,954 19,440 21,060 25,272 28,080 29,160 31,590 37,908 42,120 47,385 50,544 58,320 63,180 75,816 84,240 94,770 126,360 151,632 189,540 252,720 379,080 and 758,160, with no remainder.
Since 758,160 cannot be divided by just 1 and 758,160, it is not a prime number.