A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5272176 can be evenly divided by 1 2 3 4 6 7 8 12 13 14 16 17 21 24 26 28 34 39 42 48 51 52 56 68 71 78 84 91 102 104 112 119 136 142 156 168 182 204 208 213 221 238 272 273 284 312 336 357 364 408 426 442 476 497 546 568 624 663 714 728 816 852 884 923 952 994 1,092 1,136 1,207 1,326 1,428 1,456 1,491 1,547 1,704 1,768 1,846 1,904 1,988 2,184 2,414 2,652 2,769 2,856 2,982 3,094 3,408 3,536 3,621 3,692 3,976 4,368 4,641 4,828 5,304 5,538 5,712 5,964 6,188 6,461 7,242 7,384 7,952 8,449 9,282 9,656 10,608 11,076 11,928 12,376 12,922 14,484 14,768 15,691 16,898 18,564 19,312 19,383 22,152 23,856 24,752 25,347 25,844 28,968 31,382 33,796 37,128 38,766 44,304 47,073 50,694 51,688 57,936 62,764 67,592 74,256 77,532 94,146 101,388 103,376 109,837 125,528 135,184 155,064 188,292 202,776 219,674 251,056 310,128 329,511 376,584 405,552 439,348 659,022 753,168 878,696 1,318,044 1,757,392 2,636,088 and 5,272,176, with no remainder.
Since 5,272,176 cannot be divided by just 1 and 5,272,176, it is not a prime number.