answersLogoWhite

0

189 is a composite. Some quick tests, which can be done in your head:

Check if the number is even (2 is a factor). Ones place will have 0,2,4,6, or 8 if even.

Multiple of 5 (5 is a factor): Ones digit is 0 or 5.

Multiple of 3 or 9: Add up the digits in the number; if this sum is 3 or a multiple of 3, then the original number is a multiple of 3 (3 is a factor). Additionally, if this sum equals 9 or a multiple of 9, then 9 is a factor. This is the case for 189 : 1+8+9=18, which is a multiple of 9.

Since we found a factor (in addition to 1 & the original number) then the number is composite and not prime.

User Avatar

Wiki User

14y ago

Still curious? Ask our experts.

Chat with our AI personalities

EzraEzra
Faith is not about having all the answers, but learning to ask the right questions.
Chat with Ezra
ReneRene
Change my mind. I dare you.
Chat with Rene
ViviVivi
Your ride-or-die bestie who's seen you through every high and low.
Chat with Vivi
More answers

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. 189 is composite.

User Avatar

Wiki User

12y ago
User Avatar

composite

User Avatar

Wiki User

8y ago
User Avatar

Add your answer:

Earn +20 pts
Q: Is 189 a prime or composite number?
Write your answer...
Submit
Still have questions?
magnify glass
imp