A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2292732 can be evenly divided by 1 2 3 4 6 9 12 13 18 23 26 27 36 39 46 52 54 69 71 78 92 108 117 138 142 156 207 213 234 276 284 299 351 414 426 468 598 621 639 702 828 852 897 923 1,196 1,242 1,278 1,404 1,633 1,794 1,846 1,917 2,484 2,556 2,691 2,769 3,266 3,588 3,692 3,834 4,899 5,382 5,538 6,532 7,668 8,073 8,307 9,798 10,764 11,076 14,697 16,146 16,614 19,596 21,229 24,921 29,394 32,292 33,228 42,458 44,091 49,842 58,788 63,687 84,916 88,182 99,684 127,374 176,364 191,061 254,748 382,122 573,183 764,244 1,146,366 and 2,292,732, with no remainder.
Since 2,292,732 cannot be divided by just 1 and 2,292,732, it is not a prime number.