991 is a prime, the others are composite.
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991 and 1.991 is a prime number and only has factors of 1 and 991.
Yes, 991 is a prime number. It has no factors other than 1 and itself.
Yes
There are 1000 - 9 = 991 of them.
There is no importance behind the number 991, unless an individual means 911. If that was the case, 911 is very important. It is used to call for an emergency and help.