The number 1,715,616 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 23 24 28 32 36 37 42 46 48 56 63 69 72 74 84 92 96 111 112 126 138 144 148 161 168 184 207 222 224 252 259 276 288 296 322 333 336 368 414 444 483 504 518 552 592 644 666 672 736 777 828 851 888 966 1,008 1,036 1,104 1,184 1,288 1,332 1,449 1,554 1,656 1,702 1,776 1,932 2,016 2,072 2,208 2,331 2,553 2,576 2,664 2,898 3,108 3,312 3,404 3,552 3,864 4,144 4,662 5,106 5,152 5,328 5,796 5,957 6,216 6,624 6,808 7,659 7,728 8,288 9,324 10,212 10,656 11,592 11,914 12,432 13,616 15,318 15,456 17,871 18,648 20,424 23,184 23,828 24,864 27,232 30,636 35,742 37,296 40,848 46,368 47,656 53,613 61,272 71,484 74,592 81,696 95,312 107,226 122,544 142,968 190,624 214,452 245,088 285,936 428,904 571,872 857,808 and 1,715,616, with no remainder.
Since 1,715,616 cannot be divided by just 1 and 1,715,616, it is a composite number.