The number 1,431,612 can be evenly divided by 1 2 3 4 6 7 9 12 13 14 18 19 21 23 26 28 36 38 39 42 46 52 57 63 69 76 78 84 91 92 114 117 126 133 138 156 161 171 182 207 228 234 247 252 266 273 276 299 322 342 364 399 414 437 468 483 494 532 546 598 644 684 741 798 819 828 874 897 966 988 1,092 1,196 1,197 1,311 1,449 1,482 1,596 1,638 1,729 1,748 1,794 1,932 2,093 2,223 2,394 2,622 2,691 2,898 2,964 3,059 3,276 3,458 3,588 3,933 4,186 4,446 4,788 5,187 5,244 5,382 5,681 5,796 6,118 6,279 6,916 7,866 8,372 8,892 9,177 10,374 10,764 11,362 12,236 12,558 15,561 15,732 17,043 18,354 18,837 20,748 22,724 25,116 27,531 31,122 34,086 36,708 37,674 39,767 51,129 55,062 62,244 68,172 75,348 79,534 102,258 110,124 119,301 159,068 204,516 238,602 357,903 477,204 715,806 and 1,431,612, with no remainder.
Since 1,431,612 cannot be divided by just 1 and 1,431,612, it is a composite number.