It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 80 009 918 is not a prime number.
For example, 80 009 918 can be divided by 2: 80 009 918 / 2 = 40 004 959.
For 80 009 918 to be a prime number, it would have been required that 80 009 918 has only two divisors, i.e., itself and 1.
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80 009 918 is an even number, because it is evenly divisible by 2: 80 009 918 / 2 = 40 004 959.
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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 80 009 918 is about 8 944.826.
Thus, the square root of 80 009 918 is not an integer, and therefore 80 009 918 is not a square number.
The square of a number (here 80 009 918) is the result of the product of this number (80 009 918) by itself (i.e., 80 009 918 × 80 009 918); the square of 80 009 918 is sometimes called "raising 80 009 918 to the power 2", or "80 009 918 squared".
The square of 80 009 918 is 6 401 586 978 366 724 because 80 009 918 × 80 009 918 = 80 009 9182 = 6 401 586 978 366 724.
As a consequence, 80 009 918 is the square root of 6 401 586 978 366 724.
80 009 918 is a number with 8 digits.
The multiples of 80 009 918 are all integers evenly divisible by 80 009 918, that is all numbers such that the remainder of the division by 80 009 918 is zero. There are infinitely many multiples of 80 009 918. The smallest multiples of 80 009 918 are: