A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3596760 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 18 20 24 30 36 40 45 60 72 90 97 103 120 180 194 206 291 309 360 388 412 485 515 582 618 776 824 873 927 970 1,030 1,164 1,236 1,455 1,545 1,746 1,854 1,940 2,060 2,328 2,472 2,910 3,090 3,492 3,708 3,880 4,120 4,365 4,635 5,820 6,180 6,984 7,416 8,730 9,270 9,991 11,640 12,360 17,460 18,540 19,982 29,973 34,920 37,080 39,964 49,955 59,946 79,928 89,919 99,910 119,892 149,865 179,838 199,820 239,784 299,730 359,676 399,640 449,595 599,460 719,352 899,190 1,198,920 1,798,380 and 3,596,760, with no remainder.
Since 3,596,760 cannot be divided by just 1 and 3,596,760, it is not a prime number.