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Mathematics 15 Online
OpenStudy (anonymous):

Which is a prime number? A. 21 B. 31 C. 57 D. 91

OpenStudy (baseballer2014):

31

OpenStudy (anonymous):

A prime number is a number that is divisible by 1 and itself so you would have to see what number is only divisible by 1 and itself

OpenStudy (xguardians):

B. Why? Its the only one that is divisible by itself and 1 and has no other factors.

OpenStudy (anonymous):

Tyyy

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