prime numbers 19 and 91 are formed by numbers 1 and 9. write two pairs of prime numbers of these type in between 1 and 100
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To prove whether a number is a prime number, first try dividing it by 2, and see if you get a whole number. If you do, it can't be a prime number. If you don't get a whole number, next try dividing it by prime numbers: 3, 5, 7, 11 (9 is divisible by 3) and so on, always dividing by a prime number.
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