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4, 9, 25 and 49

They are squares of prime numbers.

Lvl 1

How and please explain

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All prime numbers less than 50 have exactly two factors.

e.g. 2,3,5,7,11,13,17,19,23,29,31,37,41,43 & 47.

Q: What are 3 numbers less than 50 that have exactly 2 factors?

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All numbers that have exactly two factors are prime numbers whereas composite numbers have more than two factors.

Prime squares have three factors. There are 11 of them in that range.

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.

There are 10 numbers less than 101 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100.

Related questions

Four numbers less than thirty, 12, 18, 20, and 28, each have exactly 6 factors.

By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.

11

Just 36.

14 (I think).

there are 3 no.2,3 & 5

1, 2, 3, 5, and 7

Every prime number has exactly two factors. They are '1' and the number itself. There are 15 prime numbers less than 50. A few of them are 2, 3, 5, 7, 11, 13, and 47.

All numbers that have exactly two factors are prime numbers whereas composite numbers have more than two factors.

4, 9, 25, and 49

4, 9, 25, 49

0, 1, 2, 3