The knowledge of prime numbers is useful when finding the lowest common multiple or the highest common factor of two or more numbers.
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Because you can know if your answer will be a whole number when you divide.
It is not a prime but do not know what a deposit number is.
You know that 7 is a prime number because it only has two factors.
It is a Prime Number.41 is prime.
You will know because a prime number can only be divided by itself and one (1), if it can be divided by anything else then you will know that it is not a prime number.