1: 1
4: 1, 2, 4
9: 1, 3, 9
16: 1, 2, 4, 8, 16
25: 1, 5, 25
36: 1, 2, 3, 4, 6, 9, 12, 18, 36
49: 1, 7, 49
64: 1, 2, 4, 8, 16, 32, 64
81: 1, 3, 9, 27, 81
100: 1, 2, 4, 5, 10, 20, 25, 50, 100
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.
Square numbers have odd numbers of factors.
The factors of all numbers can be written in pairs. With square numbers, one of those pairs is the same number twice. When listed singly, square numbers have an odd number of factors. All others are even.
Square numbers have an odd number of factors.
It's a square number. Square numbers have a factor pair that is the same number twice. When listed, that number occurs once.
There are square numbers (numbers which are a square of an integer), such as 4. It's factors, listed are 1, 2, and 4. All square numbers have an odd number of factors. Then there's 1, which has only 1 factor: 1. All other numbers have an even number of factors. Prime numbers will have only 2 factors (2 is even).
Square numbers have an odd number of factors.
All square numbers have an odd number of factors.
Square numbers have odd amounts of factors because the square root is listed as a single factor, not a pair of factors. For example, the factors of 25 are 1, 5, 25.
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.
No, only 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.