It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 642 674 is not a prime number.
For example, 642 674 can be divided by 2: 642 674 / 2 = 321 337.
For 642 674 to be a prime number, it would have been required that 642 674 has only two divisors, i.e., itself and 1.
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642 674 is an even number, because it is evenly divisible by 2: 642 674 / 2 = 321 337.
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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 642 674 is about 801.670.
Thus, the square root of 642 674 is not an integer, and therefore 642 674 is not a square number.
The square of a number (here 642 674) is the result of the product of this number (642 674) by itself (i.e., 642 674 × 642 674); the square of 642 674 is sometimes called "raising 642 674 to the power 2", or "642 674 squared".
The square of 642 674 is 413 029 870 276 because 642 674 × 642 674 = 642 6742 = 413 029 870 276.
As a consequence, 642 674 is the square root of 413 029 870 276.
The multiples of 642 674 are all integers evenly divisible by 642 674, that is all numbers such that the remainder of the division by 642 674 is zero. There are infinitely many multiples of 642 674. The smallest multiples of 642 674 are: