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EzraThe only odd number that has exactly 3 factors is a square number of a Prime number. This is because the only factors of a prime number are 1 and itself. So, if you square a prime number, you get an odd number with 3 factors (1, the prime number, and the square of the prime number). An example of such a number is 9, which is the square of the prime number 3 and has factors 1, 3, and 9.
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Are the factors of an odd number always odd?
Yes. An even number is defined as being evenly divisible by 2 (no fractional answers, only integers). If an odd number has an even factor, then because of the above definition, this odd number must have a factor of 2. But you will be hard pressed to find an odd number that is a multiple of 2, because that is already the definition of an even number. So, odd numbers cannot have even factors and thus odd numbers always have odd factors.
Which number from ten to twenty has an odd number of factors?
Only perfect squares can have an odd number of factors. The answer is 16. It has five factors: 1,2,4,8,16.
Which numbers between 50 and 60 have an odd number of factors?
No numbers in that range have an odd number of factors.
Is the product of an odd number of factors always a negative number?
Only if an odd number of the factors are negative numbers.
What type of number has odd numbers as factors?
Both odd and even numbers may have odd numbers as factors.
