0
A Prime number can only have adivisorof itself and 1.
Both 3 and 7 divide 21, so it cannot be a prime number.
I.e.: 21/3 = 7 and 21/7 = 3
A composite number has at least 1 divisor, and we already determined that both 3 and 7 are divisors, so:
21 is a composite number
21 is a composite number.
Still curious? Ask our experts.
Chat with our AI personalities
ViviYour ride-or-die bestie who's seen you through every high and low.
Chat with Vivi
RossEvery question is just a happy little opportunity.
Chat with Ross
BlakeAs your older brother, I've been where you are—maybe not exactly, but close enough.
Chat with BlakeAdd your answer:
Earn +20 ptsQ: Is 21 prime composite or neither?
Write your answer...
Submit
Still have questions?
Continue Learning about Math & Arithmetic
Is 21 a prime composite or neither?
Composite
What is neither a prime nor a composite number?
It is 1 that is neither a prime or a composite number The number 1 is neither prime nor composite.
What prime numbers 21?
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 21 is composite.
What is ONE composite or prime OR NEITHER?
ANSWER: One is neither prime nor composite.
Is 1 a prime a composite number or neither?
1 and 0 are neither composite or prime numbers
Trending Questions
What 2 numbers equal 20?
If the length of a simple pendulum is doubled what will be the change in its time period?
What is 8002 000 in scientific notation?
What is the number between 6 and 64?
Why are groups marginalized?
What is the meaning of affiniti?
What is the real part of a complex product?
What is 20 psi in kpa?
Is a vinyl gunite or fiberglass pool better for a waterfront home on a bay with a high water table in Florida?
Is everything 50 percent off on boxing day in Canada?
Where does the word Portia come from?
What percentage of Americans polled say they support free speech regardless of the views expressed?
What day of the week was February 13 1692?
How many numbers does the square root have?
How many people does it take to dig a ditch in a half day if it takes 7 people 8 days to dig a ditch?
What describes the relationship between one set of data that increases as another set of data increases. This is synonymous with directly related?
How many grooves are on a twelve inch record?
What does .42 inch look like on a ruler?
How do you write 1067350.00 in numbers?
Hcf of 55 77 132?
Copyright ©2025 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.