The number 2,303,028 can be evenly divided by 1 2 3 4 6 7 9 12 13 14 18 19 21 26 28 36 37 38 39 42 52 57 63 74 76 78 84 91 111 114 117 126 133 148 156 171 182 222 228 234 247 252 259 266 273 333 342 364 399 444 468 481 494 518 532 546 666 684 703 741 777 798 819 962 988 1,036 1,092 1,197 1,332 1,406 1,443 1,482 1,554 1,596 1,638 1,729 1,924 2,109 2,223 2,331 2,394 2,812 2,886 2,964 3,108 3,276 3,367 3,458 4,218 4,329 4,446 4,662 4,788 4,921 5,187 5,772 6,327 6,734 6,916 8,436 8,658 8,892 9,139 9,324 9,842 10,101 10,374 12,654 13,468 14,763 15,561 17,316 18,278 19,684 20,202 20,748 25,308 27,417 29,526 30,303 31,122 36,556 40,404 44,289 54,834 59,052 60,606 62,244 63,973 82,251 88,578 109,668 121,212 127,946 164,502 177,156 191,919 255,892 329,004 383,838 575,757 767,676 1,151,514 and 2,303,028, with no remainder.
Since 2,303,028 cannot be divided by just 1 and 2,303,028, it is a composite number.