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Which of these numbers is a prime number 1, 11, 21, 51?

Author:
February 20th, 2023

11 is a prime number.
By defintion a prime number is a number greater than one and the only whole numbers is it can be divided by to provide a whole number quotient are 1 and itself.
1 is not greater than one so it is not a prime number.
11 is only divisible by 11.
21 is visible by 1, 3, 7, and 21; not a prime number.
51 is divisble by 1, 3, 7, 17, and 51; not a prime number.
11 is the only prime number .

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