A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3650010 can be evenly divided by 1 2 3 5 6 7 10 13 14 15 21 26 30 35 39 42 49 65 70 78 91 98 105 130 147 182 191 195 210 245 273 294 382 390 455 490 546 573 637 735 910 955 1,146 1,274 1,337 1,365 1,470 1,910 1,911 2,483 2,674 2,730 2,865 3,185 3,822 4,011 4,966 5,730 6,370 6,685 7,449 8,022 9,359 9,555 12,415 13,370 14,898 17,381 18,718 19,110 20,055 24,830 28,077 34,762 37,245 40,110 46,795 52,143 56,154 74,490 86,905 93,590 104,286 121,667 140,385 173,810 243,334 260,715 280,770 365,001 521,430 608,335 730,002 1,216,670 1,825,005 and 3,650,010, with no remainder.
Since 3,650,010 cannot be divided by just 1 and 3,650,010, it is not a prime number.