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 was the real name of flo-Jo?
How do I properly fill out a passport money order?
Why does the slope of the aggregate supply curve change from the short run to the long run?
When was El Hombre y su noche created?
How much storage does a 3hr movie take on an iPhone?
Name a song with the name Joanna Armstrong-Miller in the song?
Is the reaction OH and H30 to form H20 exothermic?
Cattle prods legal in all states?
How much horse power does a 2011 Chevrolet Corvette grand sport have?
What is 4 pole bus coupler?
Did John McCain ever murder anyone?
What is the speed for a general purpose vehicle on ramps and taxiways?
What does 40 795 mean in word form?
What are some unique and creative Rubik's Cube gifts that would be perfect for a puzzle enthusiast?
Does Oceania lie in the Indian Ocean?
What would customer service management software be used for?
How far is the moon titania from uranus?
What college did ravens backup quarterback kyle boller attend?
What happened to the heart foundation from wwe?
How were black holes proved?
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.