It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 80 216 138 is not a prime number.
For example, 80 216 138 can be divided by 2: 80 216 138 / 2 = 40 108 069.
For 80 216 138 to be a prime number, it would have been required that 80 216 138 has only two divisors, i.e., itself and 1.
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80 216 138 is an even number, because it is evenly divisible by 2: 80 216 138 / 2 = 40 108 069.
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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 80 216 138 is about 8 956.346.
Thus, the square root of 80 216 138 is not an integer, and therefore 80 216 138 is not a square number.
The square of a number (here 80 216 138) is the result of the product of this number (80 216 138) by itself (i.e., 80 216 138 × 80 216 138); the square of 80 216 138 is sometimes called "raising 80 216 138 to the power 2", or "80 216 138 squared".
The square of 80 216 138 is 6 434 628 795 635 044 because 80 216 138 × 80 216 138 = 80 216 1382 = 6 434 628 795 635 044.
As a consequence, 80 216 138 is the square root of 6 434 628 795 635 044.
80 216 138 is a number with 8 digits.
The multiples of 80 216 138 are all integers evenly divisible by 80 216 138, that is all numbers such that the remainder of the division by 80 216 138 is zero. There are infinitely many multiples of 80 216 138. The smallest multiples of 80 216 138 are: