A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1735360 can be evenly divided by 1 2 4 5 8 10 11 16 17 20 22 29 32 34 40 44 55 58 64 68 80 85 88 110 116 136 145 160 170 176 187 220 232 272 290 319 320 340 352 374 440 464 493 544 580 638 680 704 748 880 928 935 986 1,088 1,160 1,276 1,360 1,496 1,595 1,760 1,856 1,870 1,972 2,320 2,465 2,552 2,720 2,992 3,190 3,520 3,740 3,944 4,640 4,930 5,104 5,423 5,440 5,984 6,380 7,480 7,888 9,280 9,860 10,208 10,846 11,968 12,760 14,960 15,776 19,720 20,416 21,692 25,520 27,115 29,920 31,552 39,440 43,384 51,040 54,230 59,840 78,880 86,768 102,080 108,460 157,760 173,536 216,920 347,072 433,840 867,680 and 1,735,360, with no remainder.
Since 1,735,360 cannot be divided by just 1 and 1,735,360, it is not a prime number.