The number 3,954,132 can be evenly divided by 1 2 3 4 6 7 9 12 13 14 17 18 21 26 28 34 36 39 42 51 52 63 68 71 78 84 91 102 117 119 126 142 153 156 182 204 213 221 234 238 252 273 284 306 357 364 426 442 468 476 497 546 612 639 663 714 819 852 884 923 994 1,071 1,092 1,207 1,278 1,326 1,428 1,491 1,547 1,638 1,846 1,988 1,989 2,142 2,414 2,556 2,652 2,769 2,982 3,094 3,276 3,621 3,692 3,978 4,284 4,473 4,641 4,828 5,538 5,964 6,188 6,461 7,242 7,956 8,307 8,449 8,946 9,282 10,863 11,076 12,922 13,923 14,484 15,691 16,614 16,898 17,892 18,564 19,383 21,726 25,347 25,844 27,846 31,382 33,228 33,796 38,766 43,452 47,073 50,694 55,692 58,149 62,764 76,041 77,532 94,146 101,388 109,837 116,298 141,219 152,082 188,292 219,674 232,596 282,438 304,164 329,511 439,348 564,876 659,022 988,533 1,318,044 1,977,066 and 3,954,132, with no remainder.
Since 3,954,132 cannot be divided by just 1 and 3,954,132, it is a composite number.