A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3070704 can be evenly divided by 1 2 3 4 6 7 8 12 13 14 16 19 21 24 26 28 37 38 39 42 48 52 56 57 74 76 78 84 91 104 111 112 114 133 148 152 156 168 182 208 222 228 247 259 266 273 296 304 312 336 364 399 444 456 481 494 518 532 546 592 624 703 728 741 777 798 888 912 962 988 1,036 1,064 1,092 1,406 1,443 1,456 1,482 1,554 1,596 1,729 1,776 1,924 1,976 2,072 2,109 2,128 2,184 2,812 2,886 2,964 3,108 3,192 3,367 3,458 3,848 3,952 4,144 4,218 4,368 4,921 5,187 5,624 5,772 5,928 6,216 6,384 6,734 6,916 7,696 8,436 9,139 9,842 10,101 10,374 11,248 11,544 11,856 12,432 13,468 13,832 14,763 16,872 18,278 19,684 20,202 20,748 23,088 26,936 27,417 27,664 29,526 33,744 36,556 39,368 40,404 41,496 53,872 54,834 59,052 63,973 73,112 78,736 80,808 82,992 109,668 118,104 127,946 146,224 161,616 191,919 219,336 236,208 255,892 383,838 438,672 511,784 767,676 1,023,568 1,535,352 and 3,070,704, with no remainder.
Since 3,070,704 cannot be divided by just 1 and 3,070,704, it is not a prime number.