A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1432600 can be evenly divided by 1 2 4 5 8 10 13 19 20 25 26 29 38 40 50 52 58 65 76 95 100 104 116 130 145 152 190 200 232 247 260 290 325 377 380 475 494 520 551 580 650 725 754 760 950 988 1,102 1,160 1,235 1,300 1,450 1,508 1,885 1,900 1,976 2,204 2,470 2,600 2,755 2,900 3,016 3,770 3,800 4,408 4,940 5,510 5,800 6,175 7,163 7,540 9,425 9,880 11,020 12,350 13,775 14,326 15,080 18,850 22,040 24,700 27,550 28,652 35,815 37,700 49,400 55,100 57,304 71,630 75,400 110,200 143,260 179,075 286,520 358,150 716,300 and 1,432,600, with no remainder.
Since 1,432,600 cannot be divided by just 1 and 1,432,600, it is not a prime number.