A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3164544 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 32 36 41 48 64 67 72 82 96 123 128 134 144 164 192 201 246 268 288 328 369 384 402 492 536 576 603 656 738 804 984 1,072 1,152 1,206 1,312 1,476 1,608 1,968 2,144 2,412 2,624 2,747 2,952 3,216 3,936 4,288 4,824 5,248 5,494 5,904 6,432 7,872 8,241 8,576 9,648 10,988 11,808 12,864 15,744 16,482 19,296 21,976 23,616 24,723 25,728 32,964 38,592 43,952 47,232 49,446 65,928 77,184 87,904 98,892 131,856 175,808 197,784 263,712 351,616 395,568 527,424 791,136 1,054,848 1,582,272 and 3,164,544, with no remainder.
Since 3,164,544 cannot be divided by just 1 and 3,164,544, it is not a prime number.