0
Still curious? Ask our experts.
Chat with our AI personalities
EzraFaith is not about having all the answers, but learning to ask the right questions.
Chat with Ezra
RafaThere's no fun in playing it safe. Why not try something a little unhinged?
Chat with Rafa
RossEvery question is just a happy little opportunity.
Chat with RossAdd your answer:
Earn +20 ptsQ: Why is 21 a prime number?
Write your answer...
Submit
Still have questions?
Continue Learning about Math & Arithmetic
Is number 21 prime or composite?
number 21 is prime
Is the prime number 21 is a prime number?
21 is a composite number, not a prime, having prime factors 3x7.
Is 21 seven a prime number?
21 is the product of two prime numbers, three and seven. A prime number is defined as a number divisible only by one or itself. So ... NO ... 21 is not a prime number.
Is 21 and 31 a prime number?
21 is composite number that is a multiple of 3. 31 is a prime number.
Is 21 a factor of a prime number?
No. The only factors of a prime number are 1 and itself. The only way that 21 could be a factor of a prime number is if it were a prime number, but it is not because 21 is also divisible by 3 and 7.
Trending Questions
How many years is 1.30 billion seconds?
A triangle with at least two sides the same length?
What does the name Ketha mean?
What is two fifths of one hundred and five?
Is 132 a prime or a composite number?
How many minutes is in 3 days and 8 hours?
What is the total distance that a P-wave will travel in 7 minutes and 20 seconds?
What is .177 in fraction?
How do you write twelve thousand and twelve thousandths in decimal form?
A circle has a diameter 15 centimeters. What is the area in square centimeters?
How many feet are in 1.13 miles?
What is a triangle with 8ft 10ft and 13ft measurements called?
What is the slope-intercept form of the equation -6x plus y equals 9?
What is the resulting degree of a polynomial when multiplying a cubic binomial and a quadratic trinomial?
What in meters is 36201 feet?
What is the recursive rule and explicit rule for 3 7 11 15?
How many syllables you see the leaves blowing off?
What Games where the angle of reflection are comonly used?
Which line is the line of best fit in the scatterplot below?
What is the weight of the mass 1200 kg?
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.