A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 949536 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 32 36 42 48 54 56 63 72 84 96 108 112 126 144 157 168 189 216 224 252 288 314 336 378 432 471 504 628 672 756 864 942 1,008 1,099 1,256 1,413 1,512 1,884 2,016 2,198 2,512 2,826 3,024 3,297 3,768 4,239 4,396 5,024 5,652 6,048 6,594 7,536 8,478 8,792 9,891 11,304 13,188 15,072 16,956 17,584 19,782 22,608 26,376 29,673 33,912 35,168 39,564 45,216 52,752 59,346 67,824 79,128 105,504 118,692 135,648 158,256 237,384 316,512 474,768 and 949,536, with no remainder.
Since 949,536 cannot be divided by just 1 and 949,536, it is not a prime number.