A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3514392 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 18 19 21 24 28 36 38 42 56 57 63 72 76 84 114 126 133 152 168 171 228 252 266 342 367 399 456 504 532 684 734 798 1,064 1,101 1,197 1,368 1,468 1,596 2,202 2,394 2,569 2,936 3,192 3,303 4,404 4,788 5,138 6,606 6,973 7,707 8,808 9,576 10,276 13,212 13,946 15,414 20,552 20,919 23,121 26,424 27,892 30,828 41,838 46,242 48,811 55,784 61,656 62,757 83,676 92,484 97,622 125,514 146,433 167,352 184,968 195,244 251,028 292,866 390,488 439,299 502,056 585,732 878,598 1,171,464 1,757,196 and 3,514,392, with no remainder.
Since 3,514,392 cannot be divided by just 1 and 3,514,392, it is not a prime number.