A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 434160 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 36 40 45 48 54 60 67 72 80 81 90 108 120 134 135 144 162 180 201 216 240 268 270 324 335 360 402 405 432 536 540 603 648 670 720 804 810 1,005 1,072 1,080 1,206 1,296 1,340 1,608 1,620 1,809 2,010 2,160 2,412 2,680 3,015 3,216 3,240 3,618 4,020 4,824 5,360 5,427 6,030 6,480 7,236 8,040 9,045 9,648 10,854 12,060 14,472 16,080 18,090 21,708 24,120 27,135 28,944 36,180 43,416 48,240 54,270 72,360 86,832 108,540 144,720 217,080 and 434,160, with no remainder.
Since 434,160 cannot be divided by just 1 and 434,160, it is not a prime number.