JSFiddle - React, Tailwind, and code Playground

JavaScript

var allNumbers = [1, 2, 4, 5, 6, 7, '8'],
someNumbers = [1, 2, 'привет', 4, 5, 6, 7],
noNumbers = ['это', 'массив', 'без', 'чисел'];

function isSymbol(val) {
	return isNaN(val) && typeof(val) !== 'string';
}

function isAllTrue(source){
	var result = 'Значение', i;

	for (i = 0; i < source.length; i++) {
		var symbol = isSymbol(source[i]);
    
    if (symbol) {
    	return false;
    }
	}	
	return result;
}
var vConsole = isAllTrue(allNumbers);

console.log(vConsole);