A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4637880 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 18 20 24 26 30 36 39 40 45 52 60 65 72 78 90 104 117 120 130 156 180 195 234 260 312 360 390 468 520 585 780 936 991 1,170 1,560 1,982 2,340 2,973 3,964 4,680 4,955 5,946 7,928 8,919 9,910 11,892 12,883 14,865 17,838 19,820 23,784 25,766 29,730 35,676 38,649 39,640 44,595 51,532 59,460 64,415 71,352 77,298 89,190 103,064 115,947 118,920 128,830 154,596 178,380 193,245 231,894 257,660 309,192 356,760 386,490 463,788 515,320 579,735 772,980 927,576 1,159,470 1,545,960 2,318,940 and 4,637,880, with no remainder.
Since 4,637,880 cannot be divided by just 1 and 4,637,880, it is not a prime number.