Don't treat 1 as prime number.

Author: trekhleb

src/algorithms/math/primality-test/__test__/trialDivision.test.js

@@ -4,7 +4,7 @@ import trialDivision from '../trialDivision'
  * @param{function(n: number)} testFunction
  */
 functionprimalityTest(testFunction){
-expect(testFunction(1)).toBeTruthy();
+expect(testFunction(1)).toBeFalsy();
 expect(testFunction(2)).toBeTruthy();
 expect(testFunction(3)).toBeTruthy();
 expect(testFunction(5)).toBeTruthy();

src/algorithms/math/primality-test/trialDivision.js

@@ -3,11 +3,11 @@
  * @return{boolean}
  */
 exportdefaultfunctiontrialDivision(number){
-if(number<=0){
-// If number is less then one then it isn't prime by definition.
+if(number<=1){
+// If number is less than one then it isn't prime by definition.
 returnfalse;
 }elseif(number<=3){
-// All numbers from 1 to 3 are prime.
+// All numbers from 2 to 3 are prime.
 returntrue;
 }