A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4264512 can be evenly divided by 1 2 3 4 6 7 8 12 14 16 19 21 24 28 32 38 42 48 56 57 64 76 84 96 112 114 133 152 167 168 192 224 228 266 304 334 336 399 448 456 501 532 608 668 672 798 912 1,002 1,064 1,169 1,216 1,336 1,344 1,596 1,824 2,004 2,128 2,338 2,672 3,173 3,192 3,507 3,648 4,008 4,256 4,676 5,344 6,346 6,384 7,014 8,016 8,512 9,352 9,519 10,688 12,692 12,768 14,028 16,032 18,704 19,038 22,211 25,384 25,536 28,056 32,064 37,408 38,076 44,422 50,768 56,112 66,633 74,816 76,152 88,844 101,536 112,224 133,266 152,304 177,688 203,072 224,448 266,532 304,608 355,376 533,064 609,216 710,752 1,066,128 1,421,504 2,132,256 and 4,264,512, with no remainder.
Since 4,264,512 cannot be divided by just 1 and 4,264,512, it is not a prime number.