It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 401 708 842 is not a prime number.
For example, 401 708 842 can be divided by 2: 401 708 842 / 2 = 200 854 421.
For 401 708 842 to be a prime number, it would have been required that 401 708 842 has only two divisors, i.e., itself and 1.
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401 708 842 is an even number, because it is evenly divisible by 2: 401 708 842 / 2 = 200 854 421.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 401 708 842 is about 20 042.676.
Thus, the square root of 401 708 842 is not an integer, and therefore 401 708 842 is not a square number.
The square of a number (here 401 708 842) is the result of the product of this number (401 708 842) by itself (i.e., 401 708 842 × 401 708 842); the square of 401 708 842 is sometimes called "raising 401 708 842 to the power 2", or "401 708 842 squared".
The square of 401 708 842 is 161 369 993 740 980 960 because 401 708 842 × 401 708 842 = 401 708 8422 = 161 369 993 740 980 960.
As a consequence, 401 708 842 is the square root of 161 369 993 740 980 960.
401 708 842 is a number with 9 digits.
The multiples of 401 708 842 are all integers evenly divisible by 401 708 842, that is all numbers such that the remainder of the division by 401 708 842 is zero. There are infinitely many multiples of 401 708 842. The smallest multiples of 401 708 842 are: