A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 704352 can be evenly divided by 1 2 3 4 6 8 11 12 16 22 23 24 29 32 33 44 46 48 58 66 69 87 88 92 96 116 132 138 174 176 184 232 253 264 276 319 348 352 368 464 506 528 552 638 667 696 736 759 928 957 1,012 1,056 1,104 1,276 1,334 1,392 1,518 1,914 2,001 2,024 2,208 2,552 2,668 2,784 3,036 3,828 4,002 4,048 5,104 5,336 6,072 7,337 7,656 8,004 8,096 10,208 10,672 12,144 14,674 15,312 16,008 21,344 22,011 24,288 29,348 30,624 32,016 44,022 58,696 64,032 88,044 117,392 176,088 234,784 352,176 and 704,352, with no remainder.
Since 704,352 cannot be divided by just 1 and 704,352, it is not a prime number.