A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3662064 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 36 42 48 49 54 56 63 72 84 98 108 112 126 144 147 168 173 189 196 216 252 294 336 346 378 392 432 441 504 519 588 692 756 784 882 1,008 1,038 1,176 1,211 1,323 1,384 1,512 1,557 1,764 2,076 2,352 2,422 2,646 2,768 3,024 3,114 3,528 3,633 4,152 4,671 4,844 5,292 6,228 7,056 7,266 8,304 8,477 9,342 9,688 10,584 10,899 12,456 14,532 16,954 18,684 19,376 21,168 21,798 24,912 25,431 29,064 32,697 33,908 37,368 43,596 50,862 58,128 65,394 67,816 74,736 76,293 87,192 101,724 130,788 135,632 152,586 174,384 203,448 228,879 261,576 305,172 406,896 457,758 523,152 610,344 915,516 1,220,688 1,831,032 and 3,662,064, with no remainder.
Since 3,662,064 cannot be divided by just 1 and 3,662,064, it is not a prime number.