function hasNumber(myString) {

  return /\d/.test(myString);

}

let val = '1234567890' 

let isnum = /^\d+$/.test(val);

if (isnum) {

  // val is a number

}

function containsNumber(str) {

  return str.match(/\d+/) !== null;

}

​

// Example usage

console.log(containsNumber("Hello World")); // Output: false

console.log(containsNumber("Hello123")); // Output: true

// add prefix to classname if a string contains numbers

<div key={uuidv4()} className={header.props && header.props.children?`header ${/\d/.test(header.props.children) ? `time_${header.props.children}`: header.props.children}`: 'header'}>{header}</div>