How to grep space?

Hi,

   I want to know how to grep space. 

Eg: input file contains

1565432 432 546
3514432 432 545
6541332 432 354
5464412 565 355
8456145 546 534
5632465 432 654

From this i need output of the lines which has 432 which are bold.

My requirement is whenever 432 comes after a space that line should be taken

grep ' 432'
awk '$2=="432"'  infile
grep -w 432 file