16, 81, 625 and so on.
Prime numbers to the 4th power.
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numbers that end in 5 or 0
Numbers with 3 or 5 factors are called square numbers.
That could either be "What numbers have 5 factors" or "What numbers have 2 and 5 as factors." Prime numbers to the fourth power, like 16 and 81, have 5 factors. Any multiple of 10 has 2 and 5 as a factor.
Prime numbers have two factors. 2, 3 and 5 are prime numbers.
All prime numbers have only two factors. 2, 3, 5, 7, 11
5