A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5905120 can be evenly divided by 1 2 4 5 8 10 13 16 17 20 26 32 34 40 52 65 68 80 85 104 130 136 160 167 170 208 221 260 272 334 340 416 442 520 544 668 680 835 884 1,040 1,105 1,336 1,360 1,670 1,768 2,080 2,171 2,210 2,672 2,720 2,839 3,340 3,536 4,342 4,420 5,344 5,678 6,680 7,072 8,684 8,840 10,855 11,356 13,360 14,195 17,368 17,680 21,710 22,712 26,720 28,390 34,736 35,360 36,907 43,420 45,424 56,780 69,472 73,814 86,840 90,848 113,560 147,628 173,680 184,535 227,120 295,256 347,360 369,070 454,240 590,512 738,140 1,181,024 1,476,280 2,952,560 and 5,905,120, with no remainder.
Since 5,905,120 cannot be divided by just 1 and 5,905,120, it is not a prime number.