0
81 is a composite number. 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.
Still curious? Ask our experts.
Chat with our AI personalities
CoachSuccess isn't just about winning—it's about vision, patience, and playing the long game.
Chat with Coach
FranI've made my fair share of mistakes, and if I can help you avoid a few, I'd sure like to try.
Chat with Fran
ProfessorI will give you the most educated answer.
Chat with ProfessorAdd your answer:
Earn +20 ptsQ: Is eighty-one a composite or prime number?
Write your answer...
Submit
Still have questions?
Continue Learning about Basic Math
Is 17 prime or composite number?
It is prime
Is 86 a prime or composite number?
86 is not a prime number, so is a composite.
Is 168 a prime or a composite number?
No 168 is not a prime number it is a composite number
Is 2401 a prime or composite number?
composite
Is 555 a prime or composite?
It is a composite number.
Trending Questions
When asked to write the prime factorization of the number 27 a student wrote 9 times 3. Explain the error and write the correct answer?
Where can you find the golden ratio?
Linda's paycheck was for 500.00. When she cashed her check at the bank the teller gave her a total of 30 bills both tens and twenties. How many twenties did the teller give Linda?
What are the square numbers greater than 16 but less than 40?
How much is 1400 plus tax?
How do you write in word form 4.292?
Square of a rational number is rational?
What is 38 percent as a fraction in its lowest terms?
What percentage of the total did he spend on fruit if a man spent a total of 80 dollars at the grocery store and of this amount he spent 76 dollars on fruit?
How do you round the number 127 by the greatest place value?
What does m and pm mean?
What are the common factors of 105?
What is the decimal number of binary number 101?
How do you do percentages in math?
What is the answer to pre algebra pizzazz 6?
Is there a greatest common factor on a TI-30XA?
What percentage of information is retained through auditory learning style?
What is 163.584 in word form?
What is 2x10 to the negative 4?
What is 60 percent off 49.99?
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.