A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3214344 can be evenly divided by 1 2 3 4 6 7 8 12 14 19 21 24 28 38 42 53 56 57 76 84 106 114 133 152 159 168 212 228 266 318 361 371 399 424 456 532 636 722 742 798 1,007 1,064 1,083 1,113 1,272 1,444 1,484 1,596 2,014 2,166 2,226 2,527 2,888 2,968 3,021 3,192 4,028 4,332 4,452 5,054 6,042 7,049 7,581 8,056 8,664 8,904 10,108 12,084 14,098 15,162 19,133 20,216 21,147 24,168 28,196 30,324 38,266 42,294 56,392 57,399 60,648 76,532 84,588 114,798 133,931 153,064 169,176 229,596 267,862 401,793 459,192 535,724 803,586 1,071,448 1,607,172 and 3,214,344, with no remainder.
Since 3,214,344 cannot be divided by just 1 and 3,214,344, it is not a prime number.