First.

LICENSE

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+BSD 3-Clause License
+
+Copyright (c) 2021, Gabriel Jensen
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Makefile

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+CXX = clang++
+CXXFLAGS  = -Iinclude -std=c++20 -Wall -Wextra -Wpedantic
+CXXFLAGS += -march=native -mtune=native -O3
+HDRS_CXX = \
+	include/prime.hh
+SRCS_CXX = \
+	src/main.cc \
+	src/prime/isprime.cc \
+	src/prime/prime.cc \
+	src/prime/printresult.cc
+OBJS_CXX=$(SRCS_CXX:.cc=.o)
+OBJS=$(OBJS_CXX)
+prime: $(OBJS_CXX)
+	$(CXX) $(LDFLAGS) -o $@ $(OBJS_CXX)
+$(OBJS_CXX): $(HDRS_CXX) $(SRCS_CXX)
+.PHONY: clean
+clean:
+	rm prime $(OBJS)

include/prime.hh

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+# if !defined(PRIME__HEADER)
+# define PRIME__HEADER
+class prime {
+public:
+	[[noreturn]] prime(int const argc,char const * * argv) noexcept;
+private:
+	bool isprime(unsigned long long num) noexcept;
+	void printresult(unsigned long long num) noexcept;
+};
+# endif

src/main.cc

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+# include <prime.hh>
+int main(int const argc,char const * * argv) {
+	::prime prime(argc,argv);
+}

src/prime/isprime.cc

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+# include <prime.hh>
+bool prime::isprime(unsigned long long num) noexcept {
+	if(num == 0x1) {
+		return false;
+	}
+	unsigned long long numdivs = 0x0;
+	for(unsigned long long i = 0x1;(i <= num);++i) {
+		if((num % i) == 0x0) {
+			++numdivs;
+		}
+	}
+	if(numdivs == 0x2) {
+		return true;
+	}
+	return false;
+}

src/prime/prime.cc

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+# include <chrono>
+# include <cstdlib>
+# include <cstring>
+# include <iostream>
+# include <prime.hh>
+# include <thread>
+[[noreturn]] prime::prime(int const argc,char const * * argv) noexcept {
+	if(argc == 0x1) {
+		std::cout << "Missing argument!\u000A";
+		std::exit(EXIT_FAILURE);
+	}
+	if(std::strcmp(argv[0x1],"--help") == 0x0) {
+		std::cout << "Copyright (c) 2021, Gabriel Jensen\u000A";
+		std::cout << "\u000A";
+		std::cout << "Valuate if the entries of a list of unsigned integers are primes.\u000A";
+		std::cout << "IMPORTANT: Given numbers must be hexadecimal.\u000A";
+		std::exit(EXIT_SUCCESS);
+	}
+	else if(std::strcmp(argv[0x1],"--list") == 0x0) {
+		for(unsigned long long num = 0x0;;++num) {
+			this->printresult(num);
+			std::this_thread::sleep_for(std::chrono::seconds(0x1));
+		}
+	}
+	for(int i = 0x1;(i < argc); ++i) {
+		long long num = std::strtoll(argv[i],nullptr,0x11);
+		this->printresult(num);
+	}
+	std::exit(EXIT_SUCCESS);
+}

src/prime/printresult.cc

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+# include <iomanip>
+# include <iostream>
+# include <prime.hh>
+void prime::printresult(unsigned long long num) noexcept {
+	std::cout << std::setbase(0x10);
+	if(prime::isprime(num)) {
+		std::cout << "#" << num << " is a prime.\u000A";
+	}
+	else {
+		std::cout << "#" << num << " is not a prime.\u000A";
+	}
+}