A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 950400 can be evenly divided by 1 2 3 4 5 6 8 9 10 11 12 15 16 18 20 22 24 25 27 30 32 33 36 40 44 45 48 50 54 55 60 64 66 72 75 80 88 90 96 99 100 108 110 120 128 132 135 144 150 160 165 176 180 192 198 200 216 220 225 240 264 270 275 288 297 300 320 330 352 360 384 396 400 432 440 450 480 495 528 540 550 576 594 600 640 660 675 704 720 792 800 825 864 880 900 960 990 1,056 1,080 1,100 1,152 1,188 1,200 1,320 1,350 1,408 1,440 1,485 1,584 1,600 1,650 1,728 1,760 1,800 1,920 1,980 2,112 2,160 2,200 2,376 2,400 2,475 2,640 2,700 2,880 2,970 3,168 3,200 3,300 3,456 3,520 3,600 3,960 4,224 4,320 4,400 4,752 4,800 4,950 5,280 5,400 5,760 5,940 6,336 6,600 7,040 7,200 7,425 7,920 8,640 8,800 9,504 9,600 9,900 10,560 10,800 11,880 12,672 13,200 14,400 14,850 15,840 17,280 17,600 19,008 19,800 21,120 21,600 23,760 26,400 28,800 29,700 31,680 35,200 38,016 39,600 43,200 47,520 52,800 59,400 63,360 79,200 86,400 95,040 105,600 118,800 158,400 190,080 237,600 316,800 475,200 and 950,400, with no remainder.
Since 950,400 cannot be divided by just 1 and 950,400, it is not a prime number.