It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 637 642 is not a prime number.
For example, 637 642 can be divided by 2: 637 642 / 2 = 318 821.
For 637 642 to be a prime number, it would have been required that 637 642 has only two divisors, i.e., itself and 1.
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637 642 is an even number, because it is evenly divisible by 2: 637 642 / 2 = 318 821.
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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 637 642 is about 798.525.
Thus, the square root of 637 642 is not an integer, and therefore 637 642 is not a square number.
The square of a number (here 637 642) is the result of the product of this number (637 642) by itself (i.e., 637 642 × 637 642); the square of 637 642 is sometimes called "raising 637 642 to the power 2", or "637 642 squared".
The square of 637 642 is 406 587 320 164 because 637 642 × 637 642 = 637 6422 = 406 587 320 164.
As a consequence, 637 642 is the square root of 406 587 320 164.
The multiples of 637 642 are all integers evenly divisible by 637 642, that is all numbers such that the remainder of the division by 637 642 is zero. There are infinitely many multiples of 637 642. The smallest multiples of 637 642 are: