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Because the square root isn't listed twice.

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13y ago

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Related Questions

Odd number factors?

Perfect squares are numbers with an odd number of factors.


Numbers that have an odd number of factors are what?

perfect squares


What numbers with an odd numbers of factors?

Perfect squares have an odd number of 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.


What type of number has an odd number of factors?

A perfect square has an odd number of factors. Factors of numbers always come in pairs -- except for perfect squares. Since the square root of a perfect square is listed only once on the list of factors, it results in a list with an odd number of factors.


How many numbers which are less than 1000 have an odd number of factors?

Perfect squares have an odd number of factors. There are 31 perfect squares less than 1000.


What do all perfect squares have?

Right angles an odd number of factors


What even number less than 100 has an odd number of factors?

Perfect squares have odd numbers of factors. The perfect squares less than 100 are: 1,4,9,16,25,36,49,64,81,100. 64 seems to fit both criteria.


What has an odd number of factors?

Squares have an odd number of factors.


Why does number 25 have a odd number of factors?

Because it's a square number. All perfect squares have an odd number of factors because they have one factor pair that is the same number twice (the square root) and when the factors are listed, the number is listed once.


What type of factor has an odd number of factors?

A perfect square has an odd number of factors.


How many integers less than 100 have an odd number of factors?

There are 9 integers less than 100 that have an odd number of factors.Every factor of a number has a pair, eg 2 & 3 are a factor pair of 6; and so it would be expected that every number has an even number of factors.However, if the factor pair of a number are the same number (eg 6 & 6 are a factor pair of 36), then there will be an odd number of factors.When there is a repeated factor like this, the number is a perfect square.Thus only perfect squares have an odd number of factors.Less than 100 there are 9 perfect squares (1, 4, 9, 16, 25, 36, 49, 64 & 81) which have an odd number of factors.100 itself is a perfect square and also has an odd number of factors, but the question asked for those numbers less than 100 with an odd number of factors.