### ISNUMBER(value)

Returns the value True or False depending if the value is a number.

 value The value you want to test.

#### Remarks

 * The "value" can refer to a value, cell reference, formula or a named range.* You can use the ISODD function to return True or False depending if the value is an odd number.* You can use the ISEVEN function to return True or False depending if the value is an even number.* You can use the ISTEXT function to return True or False depending if the value is text.* You can use the ISPRIME - User Defined Function function to return if a number is a prime number.* You can use the ISINTEGER - User Defined Function function to return if a number is an integer.* You can use the ISDATE - User Defined Function function to return if a number represents a valid date.* For the Microsoft documentation refer to support.office.com

 A B 1 =ISNUMBER(4) = True 20 2 =ISNUMBER(1.25) = True some text 3 =ISNUMBER(-100) = -\$1.00 "" 4 =ISNUMBER(B1) = -\$1.00 5 =ISNUMBER("some text") = \$0.00 6 =ISNUMBER(B2) = False 7 =ISNUMBER(B3) = False 8 =ISNUMBER(B4) = False 9 =ISNUMBER(TRUE) = False 10 =ISNUMBER(FALSE) = False