A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7553430 can be evenly divided by 1 2 3 5 6 9 10 15 18 23 30 41 45 46 69 82 89 90 115 123 138 178 205 207 230 246 267 345 369 410 414 445 534 615 690 738 801 890 943 1,035 1,230 1,335 1,602 1,845 1,886 2,047 2,070 2,670 2,829 3,649 3,690 4,005 4,094 4,715 5,658 6,141 7,298 8,010 8,487 9,430 10,235 10,947 12,282 14,145 16,974 18,245 18,423 20,470 21,894 28,290 30,705 32,841 36,490 36,846 42,435 54,735 61,410 65,682 83,927 84,870 92,115 109,470 164,205 167,854 184,230 251,781 328,410 419,635 503,562 755,343 839,270 1,258,905 1,510,686 2,517,810 3,776,715 and 7,553,430, with no remainder.
Since 7,553,430 cannot be divided by just 1 and 7,553,430, it is not a prime number.