A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3767610 can be evenly divided by 1 2 3 5 6 7 10 11 14 15 21 22 30 33 35 42 49 55 66 70 77 98 105 110 147 154 165 210 231 233 245 294 330 385 462 466 490 539 699 735 770 1,078 1,155 1,165 1,398 1,470 1,617 1,631 2,310 2,330 2,563 2,695 3,234 3,262 3,495 4,893 5,126 5,390 6,990 7,689 8,085 8,155 9,786 11,417 12,815 15,378 16,170 16,310 17,941 22,834 24,465 25,630 34,251 35,882 38,445 48,930 53,823 57,085 68,502 76,890 89,705 107,646 114,170 125,587 171,255 179,410 251,174 269,115 342,510 376,761 538,230 627,935 753,522 1,255,870 1,883,805 and 3,767,610, with no remainder.
Since 3,767,610 cannot be divided by just 1 and 3,767,610, it is not a prime number.