A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5964252 can be evenly divided by 1 2 3 4 6 7 12 14 19 21 28 37 38 42 57 74 76 84 101 111 114 133 148 202 222 228 259 266 303 399 404 444 518 532 606 703 707 777 798 1,036 1,212 1,406 1,414 1,554 1,596 1,919 2,109 2,121 2,812 2,828 3,108 3,737 3,838 4,218 4,242 4,921 5,757 7,474 7,676 8,436 8,484 9,842 11,211 11,514 13,433 14,763 14,948 19,684 22,422 23,028 26,159 26,866 29,526 40,299 44,844 52,318 53,732 59,052 71,003 78,477 80,598 104,636 142,006 156,954 161,196 213,009 284,012 313,908 426,018 497,021 852,036 994,042 1,491,063 1,988,084 2,982,126 and 5,964,252, with no remainder.
Since 5,964,252 cannot be divided by just 1 and 5,964,252, it is not a prime number.