A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 731952 can be evenly divided by 1 2 3 4 6 8 9 12 13 16 17 18 23 24 26 34 36 39 46 48 51 52 68 69 72 78 92 102 104 117 136 138 144 153 156 184 204 207 208 221 234 272 276 299 306 312 368 391 408 414 442 468 552 598 612 624 663 782 816 828 884 897 936 1,104 1,173 1,196 1,224 1,326 1,564 1,656 1,768 1,794 1,872 1,989 2,346 2,392 2,448 2,652 2,691 3,128 3,312 3,519 3,536 3,588 3,978 4,692 4,784 5,083 5,304 5,382 6,256 7,038 7,176 7,956 9,384 10,166 10,608 10,764 14,076 14,352 15,249 15,912 18,768 20,332 21,528 28,152 30,498 31,824 40,664 43,056 45,747 56,304 60,996 81,328 91,494 121,992 182,988 243,984 365,976 and 731,952, with no remainder.
Since 731,952 cannot be divided by just 1 and 731,952, it is not a prime number.