Prime numbers are positive, non-zero numbers that have exactly two factors. So in your case, 59 and 61. 55 is divisible by 5. 56 is divisible by 2. 57 is divisible by 3. 58 is divisible by 2. And 60 is divisible by 2.
For the answer to the question above asking h<span>ow many more book does the other grade need to read to have the same rate? I think the answer here is </span>the 7 grader needs to read 94 more books in order to catch up with 6 grade.
