A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2117610 can be evenly divided by 1 2 3 5 6 9 10 11 15 18 22 23 27 30 31 33 45 46 54 55 62 66 69 90 93 99 110 115 135 138 155 165 186 198 207 230 253 270 279 297 310 330 341 345 414 465 495 506 558 594 621 682 690 713 759 837 930 990 1,023 1,035 1,242 1,265 1,395 1,426 1,485 1,518 1,674 1,705 2,046 2,070 2,139 2,277 2,530 2,790 2,970 3,069 3,105 3,410 3,565 3,795 4,185 4,278 4,554 5,115 6,138 6,210 6,417 6,831 7,130 7,590 7,843 8,370 9,207 10,230 10,695 11,385 12,834 13,662 15,345 15,686 18,414 19,251 21,390 22,770 23,529 30,690 32,085 34,155 38,502 39,215 46,035 47,058 64,170 68,310 70,587 78,430 92,070 96,255 117,645 141,174 192,510 211,761 235,290 352,935 423,522 705,870 1,058,805 and 2,117,610, with no remainder.
Since 2,117,610 cannot be divided by just 1 and 2,117,610, it is not a prime number.