A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1497048 can be evenly divided by 1 2 3 4 6 7 8 12 14 19 21 24 28 38 42 49 56 57 67 76 84 98 114 133 134 147 152 168 196 201 228 266 268 294 392 399 402 456 469 532 536 588 798 804 931 938 1,064 1,176 1,273 1,407 1,596 1,608 1,862 1,876 2,546 2,793 2,814 3,192 3,283 3,724 3,752 3,819 5,092 5,586 5,628 6,566 7,448 7,638 8,911 9,849 10,184 11,172 11,256 13,132 15,276 17,822 19,698 22,344 26,264 26,733 30,552 35,644 39,396 53,466 62,377 71,288 78,792 106,932 124,754 187,131 213,864 249,508 374,262 499,016 748,524 and 1,497,048, with no remainder.
Since 1,497,048 cannot be divided by just 1 and 1,497,048, it is not a prime number.