The number 3,203,928 can be evenly divided by 1 2 3 4 6 7 8 9 12 13 14 18 21 24 26 27 28 36 39 42 52 54 56 63 72 78 84 91 104 108 117 126 156 163 168 182 189 216 234 252 273 312 326 351 364 378 468 489 504 546 652 702 728 756 819 936 978 1,092 1,141 1,304 1,404 1,467 1,512 1,638 1,956 2,119 2,184 2,282 2,457 2,808 2,934 3,276 3,423 3,912 4,238 4,401 4,564 4,914 5,868 6,357 6,552 6,846 8,476 8,802 9,128 9,828 10,269 11,736 12,714 13,692 14,833 16,952 17,604 19,071 19,656 20,538 25,428 27,384 29,666 30,807 35,208 38,142 41,076 44,499 50,856 57,213 59,332 61,614 76,284 82,152 88,998 114,426 118,664 123,228 133,497 152,568 177,996 228,852 246,456 266,994 355,992 400,491 457,704 533,988 800,982 1,067,976 1,601,964 and 3,203,928, with no remainder.
Since 3,203,928 cannot be divided by just 1 and 3,203,928, it is a composite number.