A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6352632 can be evenly divided by 1 2 3 4 6 8 9 11 12 13 18 22 24 26 33 36 39 44 52 66 72 78 88 99 104 117 132 143 156 198 234 264 286 312 396 429 468 572 617 792 858 936 1,144 1,234 1,287 1,716 1,851 2,468 2,574 3,432 3,702 4,936 5,148 5,553 6,787 7,404 8,021 10,296 11,106 13,574 14,808 16,042 20,361 22,212 24,063 27,148 32,084 40,722 44,424 48,126 54,296 61,083 64,168 72,189 81,444 88,231 96,252 122,166 144,378 162,888 176,462 192,504 244,332 264,693 288,756 352,924 488,664 529,386 577,512 705,848 794,079 1,058,772 1,588,158 2,117,544 3,176,316 and 6,352,632, with no remainder.
Since 6,352,632 cannot be divided by just 1 and 6,352,632, it is not a prime number.