Q: Is 635,664 a Prime Number?
A: No, 635,664 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 635664 can be evenly divided by 1 2 3 4 6 8 12 16 17 19 24 34 38 41 48 51 57 68 76 82 102 114 123 136 152 164 204 228 246 272 304 323 328 408 456 492 646 656 697 779 816 912 969 984 1,292 1,394 1,558 1,938 1,968 2,091 2,337 2,584 2,788 3,116 3,876 4,182 4,674 5,168 5,576 6,232 7,752 8,364 9,348 11,152 12,464 13,243 15,504 16,728 18,696 26,486 33,456 37,392 39,729 52,972 79,458 105,944 158,916 211,888 317,832 and 635,664, with no remainder.
Since 635,664 cannot be divided by just 1 and 635,664, it is not a prime number.