A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3613792 can be evenly divided by 1 2 4 7 8 13 14 16 17 26 28 32 34 52 56 68 73 91 104 112 119 136 146 182 208 221 224 238 272 292 364 416 442 476 511 544 584 728 884 949 952 1,022 1,168 1,241 1,456 1,547 1,768 1,898 1,904 2,044 2,336 2,482 2,912 3,094 3,536 3,796 3,808 4,088 4,964 6,188 6,643 7,072 7,592 8,176 8,687 9,928 12,376 13,286 15,184 16,133 16,352 17,374 19,856 24,752 26,572 30,368 32,266 34,748 39,712 49,504 53,144 64,532 69,496 106,288 112,931 129,064 138,992 212,576 225,862 258,128 277,984 451,724 516,256 903,448 1,806,896 and 3,613,792, with no remainder.
Since 3,613,792 cannot be divided by just 1 and 3,613,792, it is not a prime number.