A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 334620 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 13 15 18 20 22 26 30 33 36 39 44 45 52 55 60 65 66 78 90 99 110 117 130 132 143 156 165 169 180 195 198 220 234 260 286 330 338 390 396 429 468 495 507 572 585 660 676 715 780 845 858 990 1,014 1,170 1,287 1,430 1,521 1,690 1,716 1,859 1,980 2,028 2,145 2,340 2,535 2,574 2,860 3,042 3,380 3,718 4,290 5,070 5,148 5,577 6,084 6,435 7,436 7,605 8,580 9,295 10,140 11,154 12,870 15,210 16,731 18,590 22,308 25,740 27,885 30,420 33,462 37,180 55,770 66,924 83,655 111,540 167,310 and 334,620, with no remainder.
Since 334,620 cannot be divided by just 1 and 334,620, it is not a prime number.