public class LWLeaseCountExtensionsController {

  @AuraEnabled(cacheable=true)
  public static List<Account> getAccount(String AccId) {
        return [SELECT Id,LeaseWaveID__c, LW_Customer_ID__c, LW_Fleet_ID__c, LW_Account_ID__c, LW_SubAccount_ID__c from Account where Id=:AccId Limit 1];
    }

    @AuraEnabled()
    public integer lc;

/*This was the original code that I tried first, but since it didn't work with a return type of Integer, I commented out the below method and created the next method which take a list of Integer as return type  */
 @AuraEnabled(cacheable=true)
    public static Integer getLeaseCount(string LeaseWaveID) {
      Integer lc = !string.isblank(LeaseWaveID) ? [SELECT COUNT() FROM DW_oData_vw_sf_Units__x WHERE Lease__c = TRUE AND LeasewaveId__c =:LeaseWaveID] : -1;

    @AuraEnabled(cacheable=true)
    public static List<Integer> getLeaseCount(string LeaseWaveID) {
        //List<integer> lc = !string.isblank(LeaseWaveID) ? [SELECT COUNT() FROM DW_oData_vw_sf_Units__x WHERE Lease__c = TRUE AND LeasewaveId__c =:LeaseWaveID] : -1;
        List<integer> lc;
        Integer i;
        if(LeaseWaveID!=null)
             i=[SELECT COUNT() FROM DW_oData_vw_sf_Units__x WHERE Lease__c = TRUE AND LeasewaveId__c =:LeaseWaveID];
        else
            i=-1;
        lc.add(i);
        system.debug('leaseWaveID1--'+lc);
        return lc;
    }

   }

import { LightningElement,api,wire,track } from 'lwc';
//import { getSObjectValue } from '@salesforce/apex';
import getAccount from '@salesforce/apex/LWLeaseCountExtensionsController.getAccount';
import Account_LeaseWaveId from '@salesforce/schema/Account.LeaseWaveID__c';
import getLeaseCount from '@salesforce/apex/LWLeaseCountExtensionsController.getLeaseCount';

export default class TestLWLeaseCountwebComponent extends LightningElement {
    @api recordId;
     @track getLeaseCount;
    @api totalLC;

    @wire(getAccount,{AccId:'$recordId' })
    accounts;

    @wire(getLeaseCount, { LeaseWaveID: Account_LeaseWaveId})
    odata;

    totalLC = JSON.stringify(this.lc);
}

<template>
    <lightning-card title="LWCount" icon-name="custom:custom63">
    <div class="boarder">
        <!-- <p class=”slds-m-bottom_small”>
            <lightning-button label=”LoadContacts” onclick={handleLoad}></lightning-button>
        </p> -->
        <template if:true={accounts.data}>
        {LeaseWaveID}
        </template>
        {totalLC}
        <template if:true={odata.data}></template>
    </div>
</lightning-card>
</template>

<template>
    <div class="boarder">
        <template if:true={accounts.data}>
            <ui>
                <template for:each={accounts.data} for:item="acc">
                    <li key={acc.Id}>{acc.LeaseWaveID__c}</li>
                </template>
            </ui>
        </template>
    </div>
</template>