A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3749382 can be evenly divided by 1 2 3 6 7 9 13 14 18 21 26 27 39 42 49 54 63 78 91 98 109 117 126 147 182 189 218 234 273 294 327 351 378 441 546 637 654 702 763 819 882 981 1,274 1,323 1,417 1,526 1,638 1,911 1,962 2,289 2,457 2,646 2,834 2,943 3,822 4,251 4,578 4,914 5,341 5,733 5,886 6,867 8,502 9,919 10,682 11,466 12,753 13,734 16,023 17,199 19,838 20,601 25,506 29,757 32,046 34,398 38,259 41,202 48,069 59,514 69,433 76,518 89,271 96,138 138,866 144,207 178,542 208,299 267,813 288,414 416,598 535,626 624,897 1,249,794 1,874,691 and 3,749,382, with no remainder.
Since 3,749,382 cannot be divided by just 1 and 3,749,382, it is not a prime number.