Prime Numbers

# Which is a prime number 91 and 117 or 84 and 156?

789 ###### 2011-08-31 01:40:00

None of these numbers are prime:

91 is divisible by 7

117 is divisible by 3

84 and 156 are both divisible by 2

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## Related Questions Neither number is prime: 117 is divisible by 3 and 84 is divisible by 2. Neither number is prime: both are divisible by 2. The GCF of 84 and 156 is 12.First, find the prime factors:84 = 2*2*3*7156 = 2*2*3*13Then, to determine the gcf, multiply the shared prime factors:GCF = 2*2*3 = 12 No prime numbers equal 84. The only number equal to 84 is 84,and it isn't a prime number.The prime factors of 84 are: 1, 2, 2, 3, and 7     84 is a composite number. as it is divisible by 1,2,3.. etc. It is a composite number ( 2 goes into 84 right?) 7 is the largest prime factor in 84. The prime factors of 84 are 22 x 3 x 7. No. The only even prime number is 2. 84 is a composite number because it has more the 2 factors   The greatest common factor of the numbers 84, 120 and 156 is 12. 84 is a composite number.Its factors are 1,2,3,4,6,7,12,14,21,28,42,and 84All even numbers greater than 2 are composite. The greatest common factor of 84 132 and 156 is 12.  If two prime number have a sum of 54 they cannot have a sum of 84, and conversely. 6Improved answer:The prime factors of 84 are 2, 3 and 7: 2*2*3*7 = 846 is not a prime number because it has more than two factors. Yes. A prime number can only be divided by 1 and itself. 84 can be divided by 1,2,3,4,6,7,12,14 and so on. The HCF of 21, 84 and 91 is.... 1 ! The number 91 is a prime number. 84 is not a prime. All numbers ending in four are composite. ###### Prime NumbersMath and ArithmeticNumbers Factoring and MultiplesComposite Numbers Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.