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Sum of the digits of 87 = 8+7 =15(a multiple of 3) which means that 87 is divisible by 3.
Therefore, 87 is not a Prime number as it has more than two factors which are 1, 87, 3 etc.
In order to prove that a given number is prime we shall show that the given number has more than two factors. There is no need to find all the factors.
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Why isn't 87 a prime number?
87 is not a prime number because 87 is divisible by 3 and 29.
Are 59 and 87 prime numbers?
Well, 59 is a prime number but87 is not a prime number!87 can be divided by more then 1 and itself, (87/3=29)59 cant.So that makes 59 a prime number and 87 is not a prime number!
Why is 87 a prime number?
87 is NOT a prime number. It has factors 3 and 29 aside from 1 and itself.
Write the number 87 as a product of prime factors?
87 = 3 x 29
Is 87 composite or prime?
87 is composite. It can be divided by 1 and 87 and 3 and 29.87 is not a Prime number as it can be divided by 3 and 29
