Update cheatsheets

openssl-prime

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# openssl prime
+
+> OpenSSL command to compute prime numbers.
+> More information: <https://www.openssl.org/docs/manmaster/man1/openssl-prime.html>.
+
+- Generate a 2048bit prime number and display it in hexadecimal:
+
+`openssl prime -generate -bits 2048 -hex`
+
+- Check if a given number is prime:
+
+`openssl prime {{number}}`