public class Question1ControllerClass {
    @AuraEnabled
    public static Boolean insertAccount(String acc) {
        Account accObj = (Account) JSON.deserialize(acc, Account.class);
       Database.SaveResult result = Database.insert(accObj, false);
        
        
        System.debug('-->'+accObj+'-----'+result);
        if(result.isSuccess())
            return true;
        else
            return false;
    }
}

<aura:component controller="Question1ControllerClass" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes,force:lightningQuickAction" access="global" >
    <!--aura:attribute name="AccountObj" type="Account" default="{'sObject':'Account'}" /-->
    <aura:attribute name="accountName" type="String"/>
    <aura:attribute name="accountNumOfEmployee" type="Integer"/>
    
    <div class="slds-m-top_medium slds-m-bottom_x-large">
        <div class="slds-p-around_medium lgc-bg">
            
            <lightning:input type="text" label="Account Name" placeholder="type here..." value="{! v.accountName }" aura:id="accName" required="True"/>
        </div>
        
        <div class="slds-p-around_medium lgc-bg">
            
            <lightning:input type="text" label="Account No. Of Employee " placeholder="type here..." value="{! v.accountNumber }" aura:id="accName"/>
        </div>
    </div>
    <div class="slds-m-top_small slds-m-bottom_medium">
        <lightning:button variant="brand" label="INSERT" onclick="{! c.handleClick }" class="slds-m-left_x-small"/>
    </div>
</aura:component>

({
	handleClick : function(component, event, helper) {
		let action = component.get('c.insertAccount');
        var account = new Object();
        
        account.Name = component.get('v.accountName');
        account.NumberOfEmployees = component.get('v.accountNumOfEmployee');
       
        
        action.setParams({
            acc: JSON.stringify(account)
        });
        action.setCallback(this, function(response){
            let res = response.getReturnValue();
            alert(res);
        });
       // console.log(component.find('accName').get('v.value'));
        $A.enqueueAction(action);
	}
})