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Do all square numbers have exactly 3 factors?
No. 81=9*9=3*27=1*81 81 has 5 factors and is a square number. 36=6*6=3*12=1*36=2*18=4*9 36 has 9 factors and is a square number. This doesn't mean that no square numbers have exactly 3 factors though, because: 9=3*3=1*9 9 has 3 factors and is a square number. 4=2*2=1*4 4 has 3 factors and is a square number. All square numbers have an odd number of factors though (because they have a whole number which multiplies by itself to get the number). Factors are whole numbers only, and not decimals. Hope this helps :)
What are all the odd factors of 20?
1 and 5 are the factors of 20 which are odd.
What numbers are multiples of 9 and factor of 36?
Multiples of 9 that are factors of 36 include 9 and 18. A multiple of a number is any number that can be divided by that number without leaving a remainder. A factor of a number is a number that divides the original number without leaving a remainder. In this case, 9 and 18 are both multiples of 9 and factors of 36 because they can be divided evenly into 36.
What is the number between 60 and 70 that has an odd number of factors?
64 because 8*8=64. you just have to find the square number.
How many 3 digit numbers have even no of factors?
878 three digit numbers have an even number of factors. Every factor of a number has a pair, so there ought to be an even number of factors for every number. However, if a pair of the factors are the same number, then there will be an odd number of factors, that is if the number is a perfect square. Assuming three digit numbers are 100 to 999: From 100 to 999, the perfect squares are 102 = 100 to 312 = 961, a total of 31-10+1 = 22 numbers. So of the 999-100+1 = 900 three digit numbers, 22 have an odd number of factors, so 900-22 = 878 have an even number of factors.
