A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3626532 can be evenly divided by 1 2 3 4 6 7 9 12 13 14 18 21 26 27 28 36 39 41 42 52 54 63 78 81 82 84 91 108 117 123 126 156 162 164 182 189 234 243 246 252 273 287 324 351 364 369 378 468 486 492 533 546 567 574 702 738 756 819 861 972 1,053 1,066 1,092 1,107 1,134 1,148 1,404 1,476 1,599 1,638 1,701 1,722 2,106 2,132 2,214 2,268 2,457 2,583 3,159 3,198 3,276 3,321 3,402 3,444 3,731 4,212 4,428 4,797 4,914 5,166 6,318 6,396 6,642 6,804 7,371 7,462 7,749 9,594 9,828 9,963 10,332 11,193 12,636 13,284 14,391 14,742 14,924 15,498 19,188 19,926 22,113 22,386 23,247 28,782 29,484 30,996 33,579 39,852 43,173 44,226 44,772 46,494 57,564 67,158 69,741 86,346 88,452 92,988 100,737 129,519 134,316 139,482 172,692 201,474 259,038 278,964 302,211 402,948 518,076 604,422 906,633 1,208,844 1,813,266 and 3,626,532, with no remainder.
Since 3,626,532 cannot be divided by just 1 and 3,626,532, it is not a prime number.