A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7223370 can be evenly divided by 1 2 3 5 6 7 10 11 14 15 21 22 30 33 35 42 53 55 59 66 70 77 105 106 110 118 154 159 165 177 210 231 265 295 318 330 354 371 385 413 462 530 583 590 649 742 770 795 826 885 1,113 1,155 1,166 1,239 1,298 1,590 1,749 1,770 1,855 1,947 2,065 2,226 2,310 2,478 2,915 3,127 3,245 3,498 3,710 3,894 4,081 4,130 4,543 5,565 5,830 6,195 6,254 6,490 8,162 8,745 9,086 9,381 9,735 11,130 12,243 12,390 13,629 15,635 17,490 18,762 19,470 20,405 21,889 22,715 24,486 27,258 31,270 34,397 40,810 43,778 45,430 46,905 61,215 65,667 68,145 68,794 93,810 103,191 109,445 122,430 131,334 136,290 171,985 206,382 218,890 240,779 328,335 343,970 481,558 515,955 656,670 722,337 1,031,910 1,203,895 1,444,674 2,407,790 3,611,685 and 7,223,370, with no remainder.
Since 7,223,370 cannot be divided by just 1 and 7,223,370, it is not a prime number.