A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2375460 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 27 30 36 45 53 54 60 83 90 106 108 135 159 166 180 212 249 265 270 318 332 415 477 498 530 540 636 747 795 830 954 996 1,060 1,245 1,431 1,494 1,590 1,660 1,908 2,241 2,385 2,490 2,862 2,988 3,180 3,735 4,399 4,482 4,770 4,980 5,724 7,155 7,470 8,798 8,964 9,540 11,205 13,197 14,310 14,940 17,596 21,995 22,410 26,394 28,620 39,591 43,990 44,820 52,788 65,985 79,182 87,980 118,773 131,970 158,364 197,955 237,546 263,940 395,910 475,092 593,865 791,820 1,187,730 and 2,375,460, with no remainder.
Since 2,375,460 cannot be divided by just 1 and 2,375,460, it is not a prime number.