A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3194016 can be evenly divided by 1 2 3 4 6 7 8 12 14 16 21 24 28 32 42 48 49 56 84 96 97 98 112 147 168 194 196 224 291 294 336 343 388 392 582 588 672 679 686 776 784 1,029 1,164 1,176 1,358 1,372 1,552 1,568 2,037 2,058 2,328 2,352 2,716 2,744 3,104 4,074 4,116 4,656 4,704 4,753 5,432 5,488 8,148 8,232 9,312 9,506 10,864 10,976 14,259 16,296 16,464 19,012 21,728 28,518 32,592 32,928 33,271 38,024 57,036 65,184 66,542 76,048 99,813 114,072 133,084 152,096 199,626 228,144 266,168 399,252 456,288 532,336 798,504 1,064,672 1,597,008 and 3,194,016, with no remainder.
Since 3,194,016 cannot be divided by just 1 and 3,194,016, it is not a prime number.