Q: Is 685,608 a Prime Number?
A: No, 685,608 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 685608 can be evenly divided by 1 2 3 4 6 7 8 11 12 14 21 22 24 28 33 42 44 49 53 56 66 77 84 88 98 106 132 147 154 159 168 196 212 231 264 294 308 318 371 392 424 462 539 583 588 616 636 742 924 1,078 1,113 1,166 1,176 1,272 1,484 1,617 1,749 1,848 2,156 2,226 2,332 2,597 2,968 3,234 3,498 4,081 4,312 4,452 4,664 5,194 6,468 6,996 7,791 8,162 8,904 10,388 12,243 12,936 13,992 15,582 16,324 20,776 24,486 28,567 31,164 32,648 48,972 57,134 62,328 85,701 97,944 114,268 171,402 228,536 342,804 and 685,608, with no remainder.
Since 685,608 cannot be divided by just 1 and 685,608, it is not a prime number.