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
What are a president's duties?
How many days before tomorrow?
What is a person who wants to keep the old ways peacefull?
What happens when you put bleach and toothpaste in a envelope together?
What element do amines contain that aldehydes and alcohol do not?
When was Yamaha r1 fuel injected?
A sentence for the word cooperate?
What is a 1968 Baltimore Orioles photo pennant worth?
What were the Ghettos and how were they used?
What is the exposition of the movie frozen?
Do ball pen works on the principle of viscosity?
If an aircraft flew at 400km an hour to its destination and returned at 500kmh and the total trip equals 9 hours how far did the aircraft fly and how do you do the formula to solve?
Where can you find replacement lean adjustment screw and plastic washer assembly for a nordica 982 ski boot?
Is 6.18 greater than 6.108?
Who died on swamp loggers?
What is 2x-2 plus 3?
What is the mistake in 123456789?
What gift did John Lennon's aunt Mimi receive from a Beatle fan?
Disadvantage of rearing cattle indoors?
How many times did the Dallas Cowboys win back-to-back super bowls?
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.