<div id="app">
  <v-app id="inspire">
    <v-form>
      <v-container>
        <v-row>
  
          <v-col cols="12" sm="6">
            <v-text-field
              v-model="number"
              type="number"
              :rules="[rules.required, rules.counter]"
              label="Title"
              counter
            ></v-text-field>
          </v-col>
  
  
        </v-row>
      </v-container>
    </v-form>
  </v-app>
</div>

new Vue({
  el: '#app',
  vuetify: new Vuetify(),
  data () {
    return {
      number: 2,
      rules: {
        required: value => !!value || 'Required.',
        counter: value => value > 1 || 'Min 1.01',
      },
    }
  },
})