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Square numbers, like 36 and 64.

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Q: Which numbers less than 100 have odd proper factors?
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Which numbers less than 100 have even proper factors?

All even numbers greater than 2 have even proper factors, since they all have 2 as a proper factor.


The sum of the proper factors of 4 is less than 4 List all the numbers through 50 for which the sum of its proper factors is one less than the number itself?

The numbers for which the sum of its proper factors is 1 less than the number is the powers of 2; less than 50 these are: 2, 4, 8, 16 & 32.


What are all the numbers less than 100 that have odd proper factors?

There are 10 numbers less than 101 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100.


Is 9 prime?

No 9 is not prime. It's factors are 1,3,9. Proper factors: 1,3. Factors are numbers that are multiplied with other numbers to get a product. Proper factors are factors of a number except for itself. No 9 is not prime. It's factors are 1,3,9. Proper factors: 1,3. Factors are numbers that are multiplied with other numbers to get a product. Proper factors are factors of a number except for itself. Composite numbers are numbers with more than 2 factors and more than 1 proper factor. Prime is the opposite of composite.


Is the number 9 prime?

No 9 is not prime. It's factors are 1,3,9. Proper factors: 1,3. Factors are numbers that are multiplied with other numbers to get a product. Proper factors are factors of a number except for itself. Composite numbers are numbers with more than 2 factors and more than 1 proper factor. Prime is the opposite of composite.


What are two consecutive numbers less than 100 that have four proper factors?

44 and 45 75 and 76 98 and 99


Are mixed numbers less than proper fractions?

No.


What numbers would have less than two factors?

Prime numbers


What is special about numbers less than fifty that have less than three factors?

They all are prime numbers except 1


What are composite factors in a number?

The factors that are composite numbers, those that have more than two factors.


What number less than 19 has more than 4 factors?

There are a few numbers that are less than 19 and have more than 4 factors. The number 10 is less than 19 and has more than four factors.


What does abundant mean in proper factors?

an abundant number is less than the sum of its proper divisors