A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 607104 can be evenly divided by 1 2 3 4 6 8 9 12 16 17 18 24 31 32 34 36 48 51 62 64 68 72 93 96 102 124 128 136 144 153 186 192 204 248 272 279 288 306 372 384 408 496 527 544 558 576 612 744 816 992 1,054 1,088 1,116 1,152 1,224 1,488 1,581 1,632 1,984 2,108 2,176 2,232 2,448 2,976 3,162 3,264 3,968 4,216 4,464 4,743 4,896 5,952 6,324 6,528 8,432 8,928 9,486 9,792 11,904 12,648 16,864 17,856 18,972 19,584 25,296 33,728 35,712 37,944 50,592 67,456 75,888 101,184 151,776 202,368 303,552 and 607,104, with no remainder.
Since 607,104 cannot be divided by just 1 and 607,104, it is not a prime number.