A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2295540 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 18 20 26 27 30 36 39 45 52 54 60 65 78 81 90 108 109 117 130 135 156 162 180 195 218 234 260 270 324 327 351 390 405 436 468 540 545 585 654 702 780 810 981 1,053 1,090 1,170 1,308 1,404 1,417 1,620 1,635 1,755 1,962 2,106 2,180 2,340 2,834 2,943 3,270 3,510 3,924 4,212 4,251 4,905 5,265 5,668 5,886 6,540 7,020 7,085 8,502 8,829 9,810 10,530 11,772 12,753 14,170 14,715 17,004 17,658 19,620 21,060 21,255 25,506 28,340 29,430 35,316 38,259 42,510 44,145 51,012 58,860 63,765 76,518 85,020 88,290 114,777 127,530 153,036 176,580 191,295 229,554 255,060 382,590 459,108 573,885 765,180 1,147,770 and 2,295,540, with no remainder.
Since 2,295,540 cannot be divided by just 1 and 2,295,540, it is not a prime number.