2011 is a prime numnber because it has no factors other than 1 and itself.
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2011 is a prime number because it has exactly two factors, 1 and itself.
yes it is!
Yes. To prove it, you can take the square root of 2011 (about 44.8), and divide 2011 by all the prime numbers under this number. You'll see none of them divide, so it's prime.
7 is a prime number!
109 is a prime number.