4, 9, 25, and 49 are all of the numbers between 1 and 100 having 3 factors.
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There are 49 numbers between 1 and 100 that are divisible by two.
Both 25 and 4 are factors of 100 and are square numbers, 25 is 52 and 4 is 22. 100 and 1 are also factors of 100, and are also square numbers: 1 is 12 and 100 is 102.
101
33 numbers between 1 and 100 are divisible by 3.
Every whole number between 1 and 50 is a factor of one or more whole numbersbetween 1 and 100.' 1 ' is a factor of every whole number.