The number 1,743,588 can be evenly divided by 1 2 3 4 6 7 9 11 12 14 17 18 21 22 28 33 34 36 37 42 44 51 63 66 68 74 77 84 99 102 111 119 126 132 148 153 154 187 198 204 222 231 238 252 259 306 308 333 357 374 396 407 444 462 476 518 561 612 629 666 693 714 748 777 814 924 1,036 1,071 1,122 1,221 1,258 1,309 1,332 1,386 1,428 1,554 1,628 1,683 1,887 2,142 2,244 2,331 2,442 2,516 2,618 2,772 2,849 3,108 3,366 3,663 3,774 3,927 4,284 4,403 4,662 4,884 5,236 5,661 5,698 6,732 6,919 7,326 7,548 7,854 8,547 8,806 9,324 11,322 11,396 11,781 13,209 13,838 14,652 15,708 17,094 17,612 20,757 22,644 23,562 25,641 26,418 27,676 34,188 39,627 41,514 47,124 48,433 51,282 52,836 62,271 79,254 83,028 96,866 102,564 124,542 145,299 158,508 193,732 249,084 290,598 435,897 581,196 871,794 and 1,743,588, with no remainder.
Since 1,743,588 cannot be divided by just 1 and 1,743,588, it is a composite number.