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Prime numbers and composite numbers are not used in daily jobs. However they are used by scientists to prove theorems.
Prime numbers are used to find the product of the prime factors of composite numbers.
All composite numbers have prime factors and these are used to find the highest common factor of 2 or more numbers and they are also used in finding the lowest common multiple of 2 or more numbers. Composite numbers have 2 or more factors while prime numbers have only 2 factors which are themselves and one
Only 63. 0 and 1 are not composite numbers and are not prime numbers (even though 1 used to be). 19 is a prime number.
To find a composite number, check if the number can be divided by 2,3,4,5, ect. If it can, it`s composite. If not, it`s prime.