diff --git a/.github/workflows/golang_test.yml b/.github/workflows/golang_test.yml
index 70b1564..f3d4fa9 100644
--- a/.github/workflows/golang_test.yml
+++ b/.github/workflows/golang_test.yml
@@ -11,16 +11,10 @@ jobs:
     strategy:
       fail-fast: false
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: setup go untuk testing
-        uses: actions/setup-go@v3
+        uses: actions/setup-go@v5
         with:
           go-version: '^1.18'
-      - name: golang ci linting
-        uses: golangci/golangci-lint-action@v3
-        with:
-          version: v1.51.0
-          args: --disable-all -E gofmt --print-linter-name
-          skip-build-cache: true
       - name: run unit testing
         run: go test $(go list ./... | grep -v 'basic\|intermediate\|utilities')
diff --git a/math/prima/cek_prima.go b/math/prima/cek_prima.go
new file mode 100644
index 0000000..da8dcfa
--- /dev/null
+++ b/math/prima/cek_prima.go
@@ -0,0 +1,21 @@
+package prima
+
+// PembagianTrial memeriksa apakah sebuah bilangan dari n adalah
+// bilangan prima
+// Parameter:
+// 	n - bilangan bulat bertipe integer 64
+//
+// Return:
+//	bool - true jika n adalah bilangan prima, false jika tidak prima
+func PembagianTrial(n int64) bool {
+	if n < 2 {
+		return false
+	}
+	
+	for i := int64(2); i < n; i++ {
+		if n % i == 0 {
+			return false
+		}
+	}
+	return true
+}
diff --git a/math/prima/cek_prima_test.go b/math/prima/cek_prima_test.go
new file mode 100644
index 0000000..0e386b4
--- /dev/null
+++ b/math/prima/cek_prima_test.go
@@ -0,0 +1,25 @@
+package prima
+
+import (
+	"testing"
+)
+
+func TestPembagianTrial(t *testing.T) {
+	testingData := []struct {
+		name      string
+		n         int64
+		ekspetasi bool
+	}{
+		{"Prima: 2", 2, true},
+		{"Prima: 3", 3, true},
+		{"Bukan prima: -5", -5, false},
+	}
+
+	for _, testingTest := range testingData {
+		t.Run(testingTest.name, func(t *testing.T) {
+			if getData := PembagianTrial(testingTest.n); getData != testingTest.ekspetasi {
+				t.Errorf("PembagianTrial(%v) = %v; ekspetasi %v", testingTest.n, getData, testingTest.ekspetasi)
+			}
+		})
+	}
+}