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31 is a Prime number.
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Earn +20 ptsQ: Which of 21 31 51 and 91 is a prime number?
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Which is a prime number 91 51 31 21?
31
Which number is prime 91 51 31 21?
31
Which is not a prime number 17 23 31 or 51?
51 is not a prime number: 3x17=51
What is a prime number 17 23 31 51?
51 is composite number
Which number is a composite number 51 41 31 11?
51 is composite.
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