It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 157 742 is not a prime number.
For example, 157 742 can be divided by 2: 157 742 / 2 = 78 871.
For 157 742 to be a prime number, it would have been required that 157 742 has only two divisors, i.e., itself and 1.
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157 742 is an even number, because it is evenly divisible by 2: 157 742 / 2 = 78 871.
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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 157 742 is about 397.167.
Thus, the square root of 157 742 is not an integer, and therefore 157 742 is not a square number.
The square of a number (here 157 742) is the result of the product of this number (157 742) by itself (i.e., 157 742 × 157 742); the square of 157 742 is sometimes called "raising 157 742 to the power 2", or "157 742 squared".
The square of 157 742 is 24 882 538 564 because 157 742 × 157 742 = 157 7422 = 24 882 538 564.
As a consequence, 157 742 is the square root of 24 882 538 564.
The multiples of 157 742 are all integers evenly divisible by 157 742, that is all numbers such that the remainder of the division by 157 742 is zero. There are infinitely many multiples of 157 742. The smallest multiples of 157 742 are: