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Q: What are the whole numbers have an odd number of factors?

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The three greatest whole numbers less than 200 that each have an odd number of factors are 144, 169 and 196.

Almost all prime numbers are odd. The number 2 is an exception, it is the only even prime number. Prime numbers are numbers which are evenly divisible only by themselves, and the number 1. Which is to say, they have no factors. So when factoring a number, the smallest factors are prime numbers. Any numbers that are not prime have factors. Prime number: A whole number only divisible by itself and 1. Odd number: A whole number that does not have a factor that is 2.

There are 12 numbers less than 150 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100,121,144.

Square numbers have an odd number of factors.

There are four odd numbers less that 100 that have 6 factor. This does not compare with even numbers that have 12 factors!

Yes. Square numbers have an odd number of factors. 49 has three factors.

Square numbers have an odd number of factors.

Square numbers have an odd number of factors.

Square numbers have an odd number of factors.

Square numbers have an odd number of factors.

Perfect squares have an odd number of factors.

Square numbers have an odd number of factors.

Square numbers have an odd number of factors.

No numbers in that range have an odd number of factors.

No odd whole numbers have 12 as a factor. 1 and 3 are odd numbers that are factors of 12.

Both odd and even numbers may have odd numbers as factors.

No. Consider 15: 1,3,5,15 Every positive whole number has an even number of factors, unless the number is a perfect square.

Yes, quare numbers have an odd number of factors.

Perfect squares are numbers with an odd number of factors.

Square numbers have an odd number of factors.

All square numbers have an odd number of factors.

Square numbers have an odd number of factors, but beyond that, any odd number can be a factor.

144, 121 and 100

Even powers of prime numbers. Square numbers have an odd number of factors.

Square numbers have an odd number of factors.