Minimum and maximum allowable product quantities to be added in WooCommerce Cart

woocommerce_quantity_input_min : Allows to change the minimum value for the quantity. Default value is 0.
woocommerce_quantity_input_max : Allows to change maximum value for the quantity. Default value is -1.

/*
* Changing the minimum quantity to 2 for all the WooCommerce products
*/

function woocommerce_quantity_input_min_callback( $min, $product ) {
	$min = 2;  
	return $min;
}
add_filter( 'woocommerce_quantity_input_min', 'woocommerce_quantity_input_min_callback', 10, 2 );

/*
* Changing the maximum quantity to 5 for all the WooCommerce products
*/

function woocommerce_quantity_input_max_callback( $max, $product ) {
	$max = 5;  
	return $max;
}
add_filter( 'woocommerce_quantity_input_max', 'woocommerce_quantity_input_max_callback', 10, 2 );

With backend fields:

https://www.tychesoftwares.com/how-to-set-minimum-and-maximum-allowable-product-quantities-to-be-added-in-woocommerce-cart/