64, 729, 15625 and so on.
Prime numbers to the 6th power.
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All numbers that have exactly two factors are prime numbers whereas composite numbers have more than two factors.
Prime numbers have exactly two numbers. There is theoretically an infinite number of them.
Square numbers have an odd number of factors.
Prime numbers like 2, 3, 5 and 7
4, 9, 25 and 49 They are squares of prime numbers.