A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 701220 can be evenly divided by 1 2 3 4 5 6 10 12 13 15 20 26 29 30 31 39 52 58 60 62 65 78 87 93 116 124 130 145 155 156 174 186 195 260 290 310 348 372 377 390 403 435 465 580 620 754 780 806 870 899 930 1,131 1,209 1,508 1,612 1,740 1,798 1,860 1,885 2,015 2,262 2,418 2,697 3,596 3,770 4,030 4,495 4,524 4,836 5,394 5,655 6,045 7,540 8,060 8,990 10,788 11,310 11,687 12,090 13,485 17,980 22,620 23,374 24,180 26,970 35,061 46,748 53,940 58,435 70,122 116,870 140,244 175,305 233,740 350,610 and 701,220, with no remainder.
Since 701,220 cannot be divided by just 1 and 701,220, it is not a prime number.