A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5331360 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 29 30 32 40 48 58 60 80 87 96 116 120 145 160 174 232 240 290 348 383 435 464 480 580 696 766 870 928 1,149 1,160 1,392 1,532 1,740 1,915 2,298 2,320 2,784 3,064 3,480 3,830 4,596 4,640 5,745 6,128 6,960 7,660 9,192 11,107 11,490 12,256 13,920 15,320 18,384 22,214 22,980 30,640 33,321 36,768 44,428 45,960 55,535 61,280 66,642 88,856 91,920 111,070 133,284 166,605 177,712 183,840 222,140 266,568 333,210 355,424 444,280 533,136 666,420 888,560 1,066,272 1,332,840 1,777,120 2,665,680 and 5,331,360, with no remainder.
Since 5,331,360 cannot be divided by just 1 and 5,331,360, it is not a prime number.