A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2916060 can be evenly divided by 1 2 3 4 5 6 7 10 12 14 15 20 21 28 30 35 42 53 60 70 84 105 106 131 140 159 210 212 262 265 318 371 393 420 524 530 636 655 742 786 795 917 1,060 1,113 1,310 1,484 1,572 1,590 1,834 1,855 1,965 2,226 2,620 2,751 3,180 3,668 3,710 3,930 4,452 4,585 5,502 5,565 6,943 7,420 7,860 9,170 11,004 11,130 13,755 13,886 18,340 20,829 22,260 27,510 27,772 34,715 41,658 48,601 55,020 69,430 83,316 97,202 104,145 138,860 145,803 194,404 208,290 243,005 291,606 416,580 486,010 583,212 729,015 972,020 1,458,030 and 2,916,060, with no remainder.
Since 2,916,060 cannot be divided by just 1 and 2,916,060, it is not a prime number.