It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 399 998 708 is not a prime number.
For example, 399 998 708 can be divided by 2: 399 998 708 / 2 = 199 999 354.
For 399 998 708 to be a prime number, it would have been required that 399 998 708 has only two divisors, i.e., itself and 1.
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399 998 708 is an even number, because it is evenly divisible by 2: 399 998 708 / 2 = 199 999 354.
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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 399 998 708 is about 19 999.968.
Thus, the square root of 399 998 708 is not an integer, and therefore 399 998 708 is not a square number.
The square of a number (here 399 998 708) is the result of the product of this number (399 998 708) by itself (i.e., 399 998 708 × 399 998 708); the square of 399 998 708 is sometimes called "raising 399 998 708 to the power 2", or "399 998 708 squared".
The square of 399 998 708 is 159 998 966 401 669 248 because 399 998 708 × 399 998 708 = 399 998 7082 = 159 998 966 401 669 248.
As a consequence, 399 998 708 is the square root of 159 998 966 401 669 248.
399 998 708 is a number with 9 digits.
The multiples of 399 998 708 are all integers evenly divisible by 399 998 708, that is all numbers such that the remainder of the division by 399 998 708 is zero. There are infinitely many multiples of 399 998 708. The smallest multiples of 399 998 708 are: