The number 3,506,976 can be evenly divided by 1 2 3 4 6 8 9 11 12 16 18 22 24 27 32 33 36 41 44 48 54 66 72 81 82 88 96 99 108 123 132 144 162 164 176 198 216 243 246 264 288 297 324 328 352 369 396 432 451 486 492 528 594 648 656 738 792 864 891 902 972 984 1,056 1,107 1,188 1,296 1,312 1,353 1,476 1,584 1,782 1,804 1,944 1,968 2,214 2,376 2,592 2,673 2,706 2,952 3,168 3,321 3,564 3,608 3,888 3,936 4,059 4,428 4,752 5,346 5,412 5,904 6,642 7,128 7,216 7,776 8,118 8,856 9,504 9,963 10,692 10,824 11,808 12,177 13,284 14,256 14,432 16,236 17,712 19,926 21,384 21,648 24,354 26,568 28,512 32,472 35,424 36,531 39,852 42,768 43,296 48,708 53,136 64,944 73,062 79,704 85,536 97,416 106,272 109,593 129,888 146,124 159,408 194,832 219,186 292,248 318,816 389,664 438,372 584,496 876,744 1,168,992 1,753,488 and 3,506,976, with no remainder.
Since 3,506,976 cannot be divided by just 1 and 3,506,976, it is a composite number.