There are 10 numbers less than 101 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100.
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Numbers that are prime can't be multiples of 10. Multiples of 10 can't be odd.
11,22,33,44,55,66,77,88,99
If the GCF of a given pair of numbers is 1, the LCM will be equal to their product. If the GCF is greater than 1, the LCM will be less than their product. Or, stated another way, if the two numbers have no common prime factors, their LCM will be their product.
4, 9, 25 and 49 They are squares of prime numbers.
144, 121 and 100