A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1196832 can be evenly divided by 1 2 3 4 6 7 8 12 13 14 16 21 24 26 28 32 39 42 48 52 56 78 84 91 96 104 112 137 156 168 182 208 224 273 274 312 336 364 411 416 546 548 624 672 728 822 959 1,092 1,096 1,248 1,456 1,644 1,781 1,918 2,184 2,192 2,877 2,912 3,288 3,562 3,836 4,368 4,384 5,343 5,754 6,576 7,124 7,672 8,736 10,686 11,508 12,467 13,152 14,248 15,344 21,372 23,016 24,934 28,496 30,688 37,401 42,744 46,032 49,868 56,992 74,802 85,488 92,064 99,736 149,604 170,976 199,472 299,208 398,944 598,416 and 1,196,832, with no remainder.
Since 1,196,832 cannot be divided by just 1 and 1,196,832, it is not a prime number.