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Are you sure that is the correct term?
It is usually the greatest common divisor - the number which will divide into two numbers neither being zero, without remainder. For instance the highest common divisor of 12 and 16 is 4.
A prime number is a whole number greater than one which has no divisors except one and itself. A composite number is a whole number greater than one that isn't prime, that is, a product of two or more whole numbers. See http://en.wikipedia.org/wiki/Prime_number
Fortunately, we can tweak the Eratosthenes sieve to count the number of divisors more efficiently and elegantly. And you will see that this technique works not only for number of divisors, but also for generating sum of divisors, totient function, biggest prime divisor, basically all functions that have to do with divisors!
You must convert them to improper fractions then multiply the dividend by the reciprocal of the divisor. In the expression a / b , a is the dividend, b is the divisor.
On some calculators there is a key marked with K (on the key or around it on the calculator face). Try entering the divisor then the division key then press K. If that does not work try another order. On some other calculators you press the operation key twice. Try entering the divisor first then press the division key twice. The next number you enter will be divided by the one enter before pressing the operation key. (divisor).
There are no such buttons, You'll find the lcm (least common multiple) and gcd (greatest common divisor) functions in the MATH NUM menu. Press MATH, right-arrow, and select the desired function.
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