It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 802 498 678 is not a prime number.
For example, 802 498 678 can be divided by 2: 802 498 678 / 2 = 401 249 339.
For 802 498 678 to be a prime number, it would have been required that 802 498 678 has only two divisors, i.e., itself and 1.
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802 498 678 is an even number, because it is evenly divisible by 2: 802 498 678 / 2 = 401 249 339.
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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 802 498 678 is about 28 328.408.
Thus, the square root of 802 498 678 is not an integer, and therefore 802 498 678 is not a square number.
The square of a number (here 802 498 678) is the result of the product of this number (802 498 678) by itself (i.e., 802 498 678 × 802 498 678); the square of 802 498 678 is sometimes called "raising 802 498 678 to the power 2", or "802 498 678 squared".
The square of 802 498 678 is 644 004 128 191 747 712 because 802 498 678 × 802 498 678 = 802 498 6782 = 644 004 128 191 747 712.
As a consequence, 802 498 678 is the square root of 644 004 128 191 747 712.
802 498 678 is a number with 9 digits.
The multiples of 802 498 678 are all integers evenly divisible by 802 498 678, that is all numbers such that the remainder of the division by 802 498 678 is zero. There are infinitely many multiples of 802 498 678. The smallest multiples of 802 498 678 are: