A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1460844 can be evenly divided by 1 2 3 4 6 7 9 11 12 14 17 18 21 22 28 31 33 34 36 42 44 51 62 63 66 68 77 84 93 99 102 119 124 126 132 153 154 186 187 198 204 217 231 238 252 279 306 308 341 357 372 374 396 434 462 476 527 558 561 612 651 682 693 714 748 868 924 1,023 1,054 1,071 1,116 1,122 1,302 1,309 1,364 1,386 1,428 1,581 1,683 1,953 2,046 2,108 2,142 2,244 2,387 2,604 2,618 2,772 3,069 3,162 3,366 3,689 3,906 3,927 4,092 4,284 4,743 4,774 5,236 5,797 6,138 6,324 6,732 7,161 7,378 7,812 7,854 9,486 9,548 11,067 11,594 11,781 12,276 14,322 14,756 15,708 17,391 18,972 21,483 22,134 23,188 23,562 28,644 33,201 34,782 40,579 42,966 44,268 47,124 52,173 66,402 69,564 81,158 85,932 104,346 121,737 132,804 162,316 208,692 243,474 365,211 486,948 730,422 and 1,460,844, with no remainder.
Since 1,460,844 cannot be divided by just 1 and 1,460,844, it is not a prime number.