1, 3, 29, 87
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87 is not a prime number because 87 is divisible by 3 and 29.
87 is greater than the decimal number 13.688
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!
87 is NOT a prime number. It has factors 3 and 29 aside from 1 and itself.
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.