0
21 is divisible by 3 and 7, so it is composite. 91 is divisible by 7 and 13, so it is composite. 51 is divisible by 3 and 17. 31 is divisible by only 1 and itself, so it is the Prime number.
What else can I help you with?
Related Questions
Which of 21 31 51 and 91 is a prime number?
31 is a prime number.
Which number is a prime 91 51 31 or 21?
31
Which is a prime number 91 51 31 21?
31
Which number is prime 91 51 31 21?
31
What number is a prime number 91 51 31 21?
31 is the only one that has only two factors: 1 and itself. It is the prime number.
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 prime number a.91 b.51 c.31 d. 21?
91 = 13*751 = 17*321 = 3*731 is prime. â–
Which number is a composite number 51 41 31 11?
51 is composite.
Are 31 and 51 prime numbers?
31 is prime, but 51 is not as 51=3*17.
Are 40 and 51 relativly prime?
51 is not a prime number. It is divisible by 3.
Which is not a prime number between 17 23 31 and 51?
51 = 3 x 17
Trending Questions
Why do the months have different amount of days?
Is the Rhino Virus an Equine sickness?
What is a homophone for a small island?
How do you delete dogs?
How many factors has 32?
What actors and actresses appeared in Cutthroat Island - 1995?
Which is considered to be the 'last seal' against air leakage from a tire A.Valve Core B.Valve Sealer C.Valve Stem D.Valve Cap?
Is a WiFi Router needed to use a WiFi USB adapter?
Is the movie Earth good?
Which stage does a person develop life skills and learn to take initiative?
Did pilgrims have religious freedom in England?
What is the definition of status bar in Microsoft office?
How do you get rid of stained dog tears?
Which has more calories 1 tablespoon of hellmans mayo or 1 slice of kraft American cheese?
How energy is transferred in solids?
What is the climate like on the Alamo?
What led to the rule of Caesar Augustus?
What kind of insurance allows patients to choose their own doctors and hospital?
What is empowerment and how can managers enpower others?
What is the total number of protons contained in the nucleus of a carbon1 4 atom?
Copyright ©2026 Infospace Holdings LLC, A System1 Company. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Answers.