It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 802 774 is not a prime number.
For example, 802 774 can be divided by 2: 802 774 / 2 = 401 387.
For 802 774 to be a prime number, it would have been required that 802 774 has only two divisors, i.e., itself and 1.
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802 774 is an even number, because it is evenly divisible by 2: 802 774 / 2 = 401 387.
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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 802 774 is about 895.977.
Thus, the square root of 802 774 is not an integer, and therefore 802 774 is not a square number.
The square of a number (here 802 774) is the result of the product of this number (802 774) by itself (i.e., 802 774 × 802 774); the square of 802 774 is sometimes called "raising 802 774 to the power 2", or "802 774 squared".
The square of 802 774 is 644 446 095 076 because 802 774 × 802 774 = 802 7742 = 644 446 095 076.
As a consequence, 802 774 is the square root of 644 446 095 076.
The multiples of 802 774 are all integers evenly divisible by 802 774, that is all numbers such that the remainder of the division by 802 774 is zero. There are infinitely many multiples of 802 774. The smallest multiples of 802 774 are: