The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
10 has two factor pairs:10 = 1 x 1010 = 2 x 5
One pair: it's a prime number.
1 and 38 2 and 19
18 is a single number. The factor pairs of 18 are (18,1)(9,2)(6,3)
1 and 10 are a factor pair for 10.
The factor pairs of 10 are 1*10, 2*5
Factor pairs are just the factors of a number listed in a different way. The factors of 20 are 1, 2, 4, 5, 10, 20 The factor pairs of 20 are (20,1)(10,2)(5,4)
There are 10 factor pairs for 5,000:5000,12500,21250,41000,5625,8500,10250,20200,25125,40100,50
It works by multiplying and diving for example: a factor of 10 would be 1,2,5 and the number itself 10
its a factor with two pairs of the same number
The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
These are the 16 factor pairs for the number 1,080:1080,1540,2360,3270,4216,5180,6135,8120,9108,1090,1272,1560,1854,2045,2440,2736,30
A square number has an odd number of factors, but a number with an odd number of factor pairs is nothing special.
Number of factor pairs = number of rectangles
(1, 100) (2, 50) (4, 25) (5, 20) (10, 10)
10 has two factor pairs:10 = 1 x 1010 = 2 x 5