A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1437282 can be evenly divided by 1 2 3 6 7 9 11 14 17 18 21 22 33 34 42 51 61 63 66 77 99 102 119 122 126 153 154 183 187 198 231 238 306 357 366 374 427 462 549 561 671 693 714 854 1,037 1,071 1,098 1,122 1,281 1,309 1,342 1,386 1,683 2,013 2,074 2,142 2,562 2,618 3,111 3,366 3,843 3,927 4,026 4,697 6,039 6,222 7,259 7,686 7,854 9,333 9,394 11,407 11,781 12,078 14,091 14,518 18,666 21,777 22,814 23,562 28,182 34,221 42,273 43,554 65,331 68,442 79,849 84,546 102,663 130,662 159,698 205,326 239,547 479,094 718,641 and 1,437,282, with no remainder.
Since 1,437,282 cannot be divided by just 1 and 1,437,282, it is not a prime number.