The number 396,000 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 25 30 32 33 36 40 44 45 48 50 55 60 66 72 75 80 88 90 96 99 100 110 120 125 132 144 150 160 165 176 180 198 200 220 225 240 250 264 275 288 300 330 352 360 375 396 400 440 450 480 495 500 528 550 600 660 720 750 792 800 825 880 900 990 1,000 1,056 1,100 1,125 1,200 1,320 1,375 1,440 1,500 1,584 1,650 1,760 1,800 1,980 2,000 2,200 2,250 2,400 2,475 2,640 2,750 3,000 3,168 3,300 3,600 3,960 4,000 4,125 4,400 4,500 4,950 5,280 5,500 6,000 6,600 7,200 7,920 8,250 8,800 9,000 9,900 11,000 12,000 12,375 13,200 15,840 16,500 18,000 19,800 22,000 24,750 26,400 33,000 36,000 39,600 44,000 49,500 66,000 79,200 99,000 132,000 198,000 and 396,000, with no remainder.
Since 396,000 cannot be divided by just 1 and 396,000, it is a composite number.