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iluwatar#6 Update readme

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`@@ -28,6 +28,7 @@ Update the sample application with the snippet and add a test for it. After prov`
`28`	`28`	`*[Factorial](#factorial)`
`29`	`29`	`*[Fibonacci](#fibonacci)`
`30`	`30`	`*[Lottery](#lottery)`
	`31`	`+*[Prime](#prime)`
`31`	`32`
`32`	`33`	`###Media`
`33`	`34`	`*[Capture screen](#capture-screen)`
`@@ -251,6 +252,29 @@ Update the sample application with the snippet and add a test for it. After prov`
`251`	`252`
`252`	`253`	`[⬆ back to top](#table-of-contents)`
`253`	`254`
	`255`	`+###Prime`
	`256`	`+`
	`257`	+```java
	`258`	`+publicstaticboolean isPrime(int number) {`
	`259`	`+if (number<3) {`
	`260`	`+returntrue;`
	`261`	`+}`
	`262`	`+// check if n is a multiple of 2`
	`263`	`+if (number%2==0) {`
	`264`	`+returnfalse;`
	`265`	`+}`
	`266`	`+// if not, then just check the odds`
	`267`	`+for (int i=3; i* i<= number; i+=2) {`
	`268`	`+if (number% i==0) {`
	`269`	`+returnfalse;`
	`270`	`+}`
	`271`	`+}`
	`272`	`+returntrue;`
	`273`	`+}`
	`274`	+```
	`275`	`+`
	`276`	`+[⬆ back to top](#table-of-contents)`
	`277`	`+`
`254`	`278`	`##Media`
`255`	`279`
`256`	`280`	`###Capture screen`

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