The number 2,300,400 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 27 30 36 40 45 48 50 54 60 71 72 75 80 81 90 100 108 120 135 142 144 150 162 180 200 213 216 225 240 270 284 300 324 355 360 400 405 426 432 450 540 568 600 639 648 675 710 720 810 852 900 1,065 1,080 1,136 1,200 1,278 1,296 1,350 1,420 1,620 1,704 1,775 1,800 1,917 2,025 2,130 2,160 2,556 2,700 2,840 3,195 3,240 3,408 3,550 3,600 3,834 4,050 4,260 5,112 5,325 5,400 5,680 5,751 6,390 6,480 7,100 7,668 8,100 8,520 9,585 10,224 10,650 10,800 11,502 12,780 14,200 15,336 15,975 16,200 17,040 19,170 21,300 23,004 25,560 28,400 28,755 30,672 31,950 32,400 38,340 42,600 46,008 47,925 51,120 57,510 63,900 76,680 85,200 92,016 95,850 115,020 127,800 143,775 153,360 191,700 230,040 255,600 287,550 383,400 460,080 575,100 766,800 1,150,200 and 2,300,400, with no remainder.
Since 2,300,400 cannot be divided by just 1 and 2,300,400, it is a composite number.