Q: Is 638,400 a Prime Number?
A: No, 638,400 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 638400 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 16 19 20 21 24 25 28 30 32 35 38 40 42 48 50 56 57 60 64 70 75 76 80 84 95 96 100 105 112 114 120 133 140 150 152 160 168 175 190 192 200 210 224 228 240 266 280 285 300 304 320 336 350 380 399 400 420 448 456 475 480 525 532 560 570 600 608 665 672 700 760 798 800 840 912 950 960 1,050 1,064 1,120 1,140 1,200 1,216 1,330 1,344 1,400 1,425 1,520 1,596 1,600 1,680 1,824 1,900 1,995 2,100 2,128 2,240 2,280 2,400 2,660 2,800 2,850 3,040 3,192 3,325 3,360 3,648 3,800 3,990 4,200 4,256 4,560 4,800 5,320 5,600 5,700 6,080 6,384 6,650 6,720 7,600 7,980 8,400 8,512 9,120 9,975 10,640 11,200 11,400 12,768 13,300 15,200 15,960 16,800 18,240 19,950 21,280 22,800 25,536 26,600 30,400 31,920 33,600 39,900 42,560 45,600 53,200 63,840 79,800 91,200 106,400 127,680 159,600 212,800 319,200 and 638,400, with no remainder.
Since 638,400 cannot be divided by just 1 and 638,400, it is not a prime number.