A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2484960 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 20 24 30 31 32 40 48 60 62 80 93 96 120 124 155 160 167 186 240 248 310 334 372 465 480 496 501 620 668 744 835 930 992 1,002 1,240 1,336 1,488 1,670 1,860 2,004 2,480 2,505 2,672 2,976 3,340 3,720 4,008 4,960 5,010 5,177 5,344 6,680 7,440 8,016 10,020 10,354 13,360 14,880 15,531 16,032 20,040 20,708 25,885 26,720 31,062 40,080 41,416 51,770 62,124 77,655 80,160 82,832 103,540 124,248 155,310 165,664 207,080 248,496 310,620 414,160 496,992 621,240 828,320 1,242,480 and 2,484,960, with no remainder.
Since 2,484,960 cannot be divided by just 1 and 2,484,960, it is not a prime number.