A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1827672 can be evenly divided by 1 2 3 4 6 7 8 11 12 14 21 22 23 24 28 33 42 43 44 46 56 66 69 77 84 86 88 92 129 132 138 154 161 168 172 184 231 253 258 264 276 301 308 322 344 462 473 483 506 516 552 602 616 644 759 903 924 946 966 989 1,012 1,032 1,204 1,288 1,419 1,518 1,771 1,806 1,848 1,892 1,932 1,978 2,024 2,408 2,838 2,967 3,036 3,311 3,542 3,612 3,784 3,864 3,956 5,313 5,676 5,934 6,072 6,622 6,923 7,084 7,224 7,912 9,933 10,626 10,879 11,352 11,868 13,244 13,846 14,168 19,866 20,769 21,252 21,758 23,736 26,488 27,692 32,637 39,732 41,538 42,504 43,516 55,384 65,274 76,153 79,464 83,076 87,032 130,548 152,306 166,152 228,459 261,096 304,612 456,918 609,224 913,836 and 1,827,672, with no remainder.
Since 1,827,672 cannot be divided by just 1 and 1,827,672, it is not a prime number.