Challenge – MATH !

Who knows how to resolve this, has an award. Seriously, who can resolve this, will get an award which he/she will put on his/her blog 🙂 !
a) Show that if a natural number has only three divisors, it is the square of a prime number
b) Show that if a natural number has only four divisors, it is the cube of a prime number or the product of two prime numbers.

Try 🙂

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