It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 637 242 is not a prime number.
For example, 637 242 can be divided by 2: 637 242 / 2 = 318 621.
For 637 242 to be a prime number, it would have been required that 637 242 has only two divisors, i.e., itself and 1.
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637 242 is an even number, because it is evenly divisible by 2: 637 242 / 2 = 318 621.
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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 637 242 is about 798.274.
Thus, the square root of 637 242 is not an integer, and therefore 637 242 is not a square number.
The square of a number (here 637 242) is the result of the product of this number (637 242) by itself (i.e., 637 242 × 637 242); the square of 637 242 is sometimes called "raising 637 242 to the power 2", or "637 242 squared".
The square of 637 242 is 406 077 366 564 because 637 242 × 637 242 = 637 2422 = 406 077 366 564.
As a consequence, 637 242 is the square root of 406 077 366 564.
The multiples of 637 242 are all integers evenly divisible by 637 242, that is all numbers such that the remainder of the division by 637 242 is zero. There are infinitely many multiples of 637 242. The smallest multiples of 637 242 are: