255
1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765.
1 goes into 5 and 4 evenly.
The only whole number that goes into "7" evenly is 7.The number "7" also goes into the number "70" evenly (10x7=70).
The number that goes into both 84 and 105 evenly is 21.
1
255
1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765.
These will: 1, 3, 5, 15, 17, 51, 85, 255.
175 Goes into 875 evenly!!!!!
5 goes into 365 evenly.
1, 3, 17, 51.
1 goes into 5 and 4 evenly.
5 goes into 155 evenly. 155/5 = 31
2 goes evenly into 4 and 28
No. You can tell immediately just by looking at it that it's divisible by 5. It may also be divisible by other numbers, but you don't even have to know that. It's enough that you found one more number besides '1' and '255' that goes into it evenly, and that alone is enough to tell you that it's not prime.
Out of that list, 255 is evenly divisible by 3 and 5.