Number.isInteger() to check Integer

input_number: Input value

Return value is boolean. If the input number is an integer then true is returned , otherwise false
document.write(Number.isInteger(5)) // true 
document.write(Number.isInteger(-5)) // true 
document.write(Number.isInteger(0)) // true 
document.write(Number.isInteger(5.5)) // false
document.write(Number.isInteger(-5.5)) // false  
document.write(Number.isInteger('5')) // false
document.write(Number.isInteger('abc')) // false

What is NaN ?

Factors of a number To display factors of an input number, isInteger is used to check the user input number

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