Get sObject prefix

 Pass object name in method parameter.

***

public static void getPrefix(String objName){

        Schema.sObjectType sObjType = Schema.getGlobalDescribe().get(objName);

        String prefixValue = (sObjType.getDescribe().getKeyPrefix());

        System.debug('prefixValue##' + prefixValue);

    }

***

OR you can get prefix value from here

***

Schema.DescribeSObjectResult r = Account.sObjectType.getDescribe();

String keyPrefix = r.getKeyPrefix();

System.debug('keyPrefix##' + keyPrefix);

***

Replace Account object from your object name.

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