![]() In fact, 100 is an abundant number 100 is strictly smaller than the sum of its proper divisors (that is 1 + 2 + 4 + 5 + 10 + 20 + 25 + 50 = 117). ![]() No, 100 is not a deficient number: to be deficient, 100 should have been such that 100 is larger than the sum of its proper divisors, i.e., the divisors of 100 without 100 itself (that is 1 + 2 + 4 + 5 + 10 + 20 + 25 + 50 = 117). The last digit of 100 is 0, so it is divisible by 5 and is therefore not prime.įor 100 to be a prime number, it would have been required that 100 has only two divisors, i.e., itself and 1. ![]() The list of all positive divisors (i.e., the list of all integers that divide 100) is as follows: 1, 2, 4, 5, 10, 20, 25, 50, 100.įor 100 to be a prime number, it would have been required that 100 has only two divisors, i.e., itself and 1.Īctually, one can immediately see that 100 cannot be prime, because 5 is one of its divisors: indeed, a number ending with 0 or 5 has necessarily 5 among its divisors. ![]() It is possible to find out using mathematical methods whether a given integer is a prime number or not.įor 100, the answer is: No, 100 is not a prime number. ![]()
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