It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 157 402 is not a prime number.
For example, 157 402 can be divided by 2: 157 402 / 2 = 78 701.
For 157 402 to be a prime number, it would have been required that 157 402 has only two divisors, i.e., itself and 1.
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157 402 is an even number, because it is evenly divisible by 2: 157 402 / 2 = 78 701.
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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 157 402 is about 396.739.
Thus, the square root of 157 402 is not an integer, and therefore 157 402 is not a square number.
The square of a number (here 157 402) is the result of the product of this number (157 402) by itself (i.e., 157 402 × 157 402); the square of 157 402 is sometimes called "raising 157 402 to the power 2", or "157 402 squared".
The square of 157 402 is 24 775 389 604 because 157 402 × 157 402 = 157 4022 = 24 775 389 604.
As a consequence, 157 402 is the square root of 24 775 389 604.
The multiples of 157 402 are all integers evenly divisible by 157 402, that is all numbers such that the remainder of the division by 157 402 is zero. There are infinitely many multiples of 157 402. The smallest multiples of 157 402 are: