A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3449754 can be evenly divided by 1 2 3 6 7 9 11 14 18 19 21 22 33 38 42 57 63 66 77 99 114 126 131 133 154 171 198 209 231 262 266 342 393 399 418 462 627 693 786 798 917 1,179 1,197 1,254 1,386 1,441 1,463 1,834 1,881 2,358 2,394 2,489 2,751 2,882 2,926 3,762 4,323 4,389 4,978 5,502 7,467 8,253 8,646 8,778 10,087 12,969 13,167 14,934 16,506 17,423 20,174 22,401 25,938 26,334 27,379 30,261 34,846 44,802 52,269 54,758 60,522 82,137 90,783 104,538 156,807 164,274 181,566 191,653 246,411 313,614 383,306 492,822 574,959 1,149,918 1,724,877 and 3,449,754, with no remainder.
Since 3,449,754 cannot be divided by just 1 and 3,449,754, it is not a prime number.