A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7530660 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 17 18 20 23 30 34 36 45 46 51 60 68 69 85 90 92 102 107 115 138 153 170 180 204 207 214 230 255 276 306 321 340 345 391 414 428 460 510 535 612 642 690 765 782 828 963 1,020 1,035 1,070 1,173 1,284 1,380 1,530 1,564 1,605 1,819 1,926 1,955 2,070 2,140 2,346 2,461 3,060 3,210 3,519 3,638 3,852 3,910 4,140 4,692 4,815 4,922 5,457 5,865 6,420 7,038 7,276 7,383 7,820 9,095 9,630 9,844 10,914 11,730 12,305 14,076 14,766 16,371 17,595 18,190 19,260 21,828 22,149 23,460 24,610 27,285 29,532 32,742 35,190 36,380 36,915 41,837 44,298 49,220 54,570 65,484 70,380 73,830 81,855 83,674 88,596 109,140 110,745 125,511 147,660 163,710 167,348 209,185 221,490 251,022 327,420 376,533 418,370 442,980 502,044 627,555 753,066 836,740 1,255,110 1,506,132 1,882,665 2,510,220 3,765,330 and 7,530,660, with no remainder.
Since 7,530,660 cannot be divided by just 1 and 7,530,660, it is not a prime number.