There are plenty. 4, 8, 12 and so on up to 96.
All of the composite numbers less than 100 have factor pairs.
When they have a factor in common greater than one.
80 has 5 factor pairs.
No square number is a prime number, since it has the number you squared as a factor. There are several square numbers less than 100. Just calculate the squares of all numbers, starting with 1, until you reach or pass 100. Then stop.
1 has 1 factor.
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.
100% equals the number. Less than 100% is less than the number. Greater than 100% is greater than the number.
25 is an odd factor of 100.
There are 49 even numbers less than 100, but only the number 2 is an even prime number less than 100.
Numbers less than 100 having 19 as a factor are 19, 38, 57, 76, and 95.
6
9797 is the largest prime number less than 100.