A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7536240 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 36 40 45 48 54 60 72 80 81 90 108 120 135 144 162 180 216 240 270 324 360 405 432 540 648 720 810 1,080 1,163 1,296 1,620 2,160 2,326 3,240 3,489 4,652 5,815 6,480 6,978 9,304 10,467 11,630 13,956 17,445 18,608 20,934 23,260 27,912 31,401 34,890 41,868 46,520 52,335 55,824 62,802 69,780 83,736 93,040 94,203 104,670 125,604 139,560 157,005 167,472 188,406 209,340 251,208 279,120 314,010 376,812 418,680 471,015 502,416 628,020 753,624 837,360 942,030 1,256,040 1,507,248 1,884,060 2,512,080 3,768,120 and 7,536,240, with no remainder.
Since 7,536,240 cannot be divided by just 1 and 7,536,240, it is not a prime number.