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Is it almost-prime?

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Definition: A positive integer n is almost-prime, if it can be written in the form n=p^k where p is a prime and k is also a positive integers. In other words, the prime factorization of n contains only the same number.

Input: A positive integer 2<=n<=2^31-1

Output: a truthy value, if n is almost-prime, and a falsy value, if not.

Truthy Test Cases:

Falsy Test Cases

Please do not use standard loopholes. This is code-golf so the shortest answer in bytes wins!

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If this is an answer to a challenge…

…Be sure to follow the challenge specification. However, please refrain from exploiting obvious loopholes. Answers abusing any of the standard loopholes are considered invalid. If you think a specification is unclear or underspecified, comment on the question instead.
…Try to optimize your score. For instance, answers to code-golf challenges should attempt to be as short as possible. You can always include a readable version of the code in addition to the competitive one. Explanations of your answer make it more interesting to read and are very much encouraged.
…Include a short header which indicates the language(s) of your code and its score, as defined by the challenge.

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\$\begingroup\$ @petStorm Here it is :) Thanks! \$\endgroup\$

Galen Ivanov
– Galen Ivanov

2020年08月26日 11:13:58 +00:00
Commented Aug 26, 2020 at 11:13
\$\begingroup\$ Save 13 bytes by ditching the named function. Try it online! \$\endgroup\$

chunes
– chunes

2021年03月31日 09:53:15 +00:00
Commented Mar 31, 2021 at 9:53
\$\begingroup\$ @chunes Thanks! I didn't know it's allowed when I posted it. I have at least dozen more submission using this form. \$\endgroup\$

Galen Ivanov
– Galen Ivanov

2021年03月31日 10:09:48 +00:00
Commented Mar 31, 2021 at 10:09

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